What Yorùbá Tradition Is Not
Twelve widespread misconceptions about Yorùbá religion and thought, each answered with evidence, correcting hostile distortions and celebratory overclaims alike.
This file answers the specific claims that get made about Yorùbá tradition, in both directions. Some of them come from the demonization described in the previous file and understate what the tradition contains. Others come from an enthusiastic reclamation and overstate it. Both kinds are corrected here on the same standard, which is the evidence, because a corpus that only corrected distortions running one way would not be trustworthy on the ones running the other.
Each section states the claim, gives the answer, and points to the fuller treatment.
It is devil worship
There is no devil in Yorùbá cosmology. Not a weak devil, not a different devil, none. There is no figure who is the adversary of the supreme being, no realm of eternal punishment presided over by such a figure, no cosmic contest between good and evil as opposing principles, and no notion of souls being sought for damnation. The dualism the claim presupposes is absent from the system, which means the claim is not false in its details but malformed in its structure: it asks which Yorùbá figure is the devil, and the system has no slot for the question.
The claim has a documented origin. Samuel Àjàyí Crowther, translating the Bible into Yorùbá in the mid-nineteenth century, rendered Satan as Èṣù . Èṣù in Yorùbá thought is the messenger and enforcer, the one who carries ẹbọ from ayé to ọ̀run, who stands at the crossroads and the threshold, who tests and disrupts and enforces reciprocity, and whose participation is structurally required for Ifá divination to function at all . Èṣù is unpredictable and Èṣù is not evil, and in Yorùbá thought those are different categories. Where scholars reach for a biblical comparison, the one they reach for is the figure in the Book of Job to whom God assigns the testing of a man's faith, which is a functionally assigned role rather than an opposition .
Because the identification sits inside the Yorùbá Bible rather than beside it, it stopped looking like a translator's choice and started looking like a fact about Yorùbá religion. The full history is in the file on the demonization in this section.
The òrìṣà are demons
Same structure, same answer, with an additional point.
The òrìṣà are not spirits in rebellion against a creator, because there is no rebellion in the cosmology and nothing to rebel against in the required sense. In the Yorùbá system the òrìṣà occupy a position analogous to that of intermediaries in a hierarchy: Ọlọ́dùmarè is the source, remote from daily affairs, without temples, without priests and without sacrifice, and the òrìṣà are the powers through whom the world is dealt with in practice . Ìdòwú's influential 1962 formulation was that the òrìṣà are conceptualisations of attributes of Ọlọ́dùmarè, which he called diffused monotheism, though that reading is contested and is discussed below .
The additional point is about what an òrìṣà is. Many of the major òrìṣà are, in the tradition's own account, human beings who lived and whose àṣẹ persists: Ṣàngó is remembered as a ruler of Ọ̀yọ́, Ògún as the one who cleared the path with iron, Ọ̀ṣun as associated with a specific river at a specific place. Others are understood as never having been human. The tradition does not resolve this into a single category, and the boundary between an ancestor of great standing and an òrìṣà is not sharply drawn. What this means practically is that the relationship between a Yorùbá person and an òrìṣà of their lineage has a great deal in common with the relationship to an ancestor, which is not the relationship the word "demon" describes.
It is animism, or primitive religion
"Animism" as an analytic category comes from E. B. Tylor's nineteenth-century evolutionary anthropology, which arranged religions on a ladder from animism through polytheism to monotheism with European Christianity at the top. The category was built to place non-European religion at an earlier stage of a single developmental sequence, and the sequence itself has been abandoned by anthropology. Using the term is not a neutral description; it is a nineteenth-century classification carrying a nineteenth-century verdict.
On the descriptive question, the term also does not fit. Yorùbá religion is not primarily about spirits in natural objects. Its central concerns are destiny and character, the relation between an individual and their orí, the maintenance of reciprocal obligation between the living, the ancestors and the òrìṣà, and the diagnosis and correction of a person's situation. It has a supreme being, a formal divination system with a memorised corpus, a hereditary and institutionally organised priesthood, a developed ethical vocabulary and a philosophical anthropology.
On "primitive," the historical record disposes of it. The Yorùbá were among the most urbanised populations in pre-colonial Africa, organised in walled cities with resident kings, palace bureaucracies, guild craft production and market systems administered substantially by women. Ilé-Ifẹ̀ produced sculpture in copper alloy and terracotta of a technical and naturalistic sophistication that European curators on first encounter attributed to Greek or Mediterranean influence because they could not accept an African origin. Ifá was inscribed by UNESCO as a system making use of "an extensive corpus of texts and mathematical formulas" Whatever "primitive" is supposed to denote, none of this is it.
It has no ethics
The opposite is true: ethics is the organising centre of the system rather than an appendix to it.
The governing concept is ìwà, character. The moral life in Yorùbá thought is evaluated by the quality of a person's character as it shows in conduct toward others, toward the community and toward the surrounding environment . The ideal is the ọmọlúàbí, the person of full moral standing, and the virtues named in the literature include ọ̀rọ̀ sísọ, competent and truthful speech, ìtẹríba, respect, òtító, truth, ìwà rere, good character, ìwà ìrẹ̀lẹ̀, humility, akínkanjú, courage, iṣẹ́ àṣekára, diligent work, and ọpọlọ pípé, soundness of mind . The orientation is toward cooperation, solidarity and interdependence, and the framework has been characterised as closer to virtue ethics than to a rule-based or command-based morality .
Two features distinguish it from what the claim assumes. First, its ethics is not primarily divine command. Ìwà is the criterion, and the Ifá corpus contains a substantial body of verses turning on the proposition that good character matters more than sacrifice, more than wealth and more than a favourable destiny. A person who performs every prescribed ẹbọ and has bad ìwà is, in the corpus's own account, in a worse position than one who does the reverse. Second, its ethics is constitutively relational: character is cultivated to maintain a person's standing within community, lineage and the wider order rather than as private self-perfection .
The claim that African traditional religions lacked ethics is itself traceable, to the missionary and colonial ethnography which held that morality required revealed law and therefore could not exist without it. The cosmology section of this corpus treats ìwà, ọmọlúàbí and the ethical vocabulary with primary Ifá texts.
It has no concept of a supreme being
It has one, and the name is Ọlọ́dùmarè, also Ọlọ́run. The attributes given in the literature are transcendence, omniscience and ultimate authority, with the specific features that Ọlọ́dùmarè has no images, no temples, no dedicated priesthood, and receives no sacrifice, because the divine will is not understood as something that can be altered by offering . That absence of cult is the thing most often mistaken for absence of concept: a missionary looking for evidence of the worship of a high god found none, and concluded the high god was not there, when the tradition's own position is that Ọlọ́dùmarè is not approached that way.
What is genuinely contested is how to characterise the resulting structure. Ìdòwú's Olódùmarè: God in Yoruba Belief (1962) argued for diffused monotheism, with the òrìṣà as conceptualisations of divine attributes . Critics have argued that this reading imports a Christian theological frame, and that reading the Odù to yield monotheism is an interpretive imposition rather than a finding . Bewaji's work on the problem of evil in Yorùbá thought pushes in a related direction . This corpus marks the question contested and does not adjudicate it. What is not contested, and is the point against the claim, is that a supreme being is present in the system independently of the missionary encounter.
It is one uniform religion
It is not, and treating it as one is among the more common errors in the popular literature.
Òrìṣà practice is local. Which òrìṣà are prominent varies by town and by lineage. Ọ̀ṣun is central at Ọ̀ṣogbo and marginal elsewhere; Ògún is nearly universal but with different emphases; some òrìṣà are effectively single-town. Festivals differ in date, form and content between towns twenty miles apart. The ìtàn, the narrative accounts, differ and sometimes contradict, and the tradition does not treat that as a problem to be resolved.
Structurally there is no creed, no central authority, no council empowered to declare a practice orthodox, no institution with jurisdiction over the whole, and no fixed closed scripture. The Ifá corpus is the nearest thing to a common textual reference and it is itself open, with the number of ẹsẹ "constantly increasing" in UNESCO's phrasing .
The habit of speaking about "the Yorùbá religion" in the singular is partly an artefact of the same nineteenth-century process that produced "the Yorùbá" as a single ethnic label. Peel's argument is that Yorùbá ethnic self-consciousness was substantially formed in the missionary encounter of the mid-nineteenth century, through the reduction of the language to a single written standard, the Sàró experience of mutual recognition in exile, Yorùbá-language print, and colonial administrative categories . That does not make the identity false, since all ethnic identities are historically constructed, but it does mean the singular noun postdates most of the history it is used to describe.
Sacrifice means human sacrifice
Ẹbọ means offering, and the overwhelming ordinary content of ẹbọ is kola nut, palm oil, water, cooked food, cloth and money, with a fowl or a goat in larger cases, given according to what a divination prescribes. The logic is exchange and the maintenance of relationship, and it runs continuous with how a person deals with elders, with a lineage, with a host and with a market. The Yorùbá word does not mean killing and the practice is not centrally about killing.
On the historical question, this corpus does not evade it. Human sacrifice existed in Yorubaland in specific documented contexts, principally in connection with royal funerals and with communal crisis, and the practice is attested across a number of West African societies in the same period . The Yorùbá case has been studied in detail for eastern Yorubaland in the late nineteenth century by Olatunji Ojo, whose analysis situates it in relation to slavery, economic inequality and chiefly privilege, and traces its ending to the conflict between chiefs who practised it and their opponents among slaves, Christians and British officials, in the context of the end of the Yorùbá wars and the approach of colonial rule . The victims were principally slaves and captives, which is to say that the practice was continuous with the institution of slavery rather than separate from it.
It is equally documented, and by the standard scholarly treatment of the subject, that European observers from the fifteenth century onward emphasised and exaggerated human sacrifice in West African societies in order to define Africans as barbaric and to justify conquest . Both statements hold. The practice was real, its scale was inflated by observers with a motive to inflate it, and the honest position is to say both rather than either.
Two further points of proportion. First, the practice was occasional and institutionally specific rather than a routine feature of religious life; the ordinary Yorùbá person's ordinary religious activity involved kola nut. Second, judicial execution and funerary killing at the death of rulers were features of many early modern states, European ones included, and the analytic category "human sacrifice" was applied selectively to non-European societies in a way that did most of its work by that selectivity.
It was static and unchanging
This claim is usually made in praise, which is why it needs correcting. Nothing about Yorùbá religion was static.
The òrìṣà pantheon changed over time, with òrìṣà rising and falling in prominence, being adopted between towns, and in some documented cases entering the system from outside. Ifá spread; the relationship between Ifá and other divination systems shifted; the corpus grew and continues to grow, which is why UNESCO records the number of ẹsẹ as unknown and increasing . Political change drove religious change: the rise of Ọ̀yọ́ raised Ṣàngó, and the nineteenth-century destruction of towns and dispersal of populations disrupted the lineage and place-bound institutions that carried òrìṣà practice, which is part of Peel's explanation of why conversion accelerated when it did .
The tradition also absorbed. The Aládùrà churches from the 1920s built a Christianity in Yorùbá idiom; Yorùbá Islam developed its own forms; and in the Americas the same material generated Lucumí, Candomblé and Trinidad Orisha, each shaped by its own conditions. A tradition that generates that much variation over four centuries is not a fixed inheritance being either preserved or lost, which is the frame both the hostile and the nostalgic accounts assume.
It was illiterate, therefore unintellectual
The premise about literacy is roughly right for the pre-nineteenth-century period, in that Yorùbá was not written until the mission reduced it to writing, with the first grammar and vocabulary in 1843 and the complete Bible in 1884 . Arabic literacy existed among Yorùbá Muslims well before this, through the Quranic schools of the northern towns, so the picture is not one of total absence of writing in the region.
The inference from that premise is where the claim fails. Oral does not mean unsystematic. The Ifá corpus is organised into 256 Odù with an estimated eight hundred verses each, memorised in a formal sequence over a training measured in years, with a system of signs generating the retrieval index . That is a structured, indexed, formally organised body of knowledge maintained without writing, and maintaining it without writing is a harder problem than maintaining it with writing, not an easier one. The oríkì tradition holds genealogical, historical and biographical material in verse across generations. The proverb corpus, owe, carries a compressed argumentative and ethical literature that Yorùbá speakers deploy in reasoning.
There is also a positive argument that the system encodes formal structure. UNESCO's description refers to Ifá's "extensive corpus of texts and mathematical formulas" Ron Eglash's African Fractals (1999) treats Ifá as among the more developed indigenous mathematical systems and identifies combinatorial reasoning in it . Olu Longe's work analyses Ifá in terms of binary representation, Boolean algebra and memory addressing . What exactly follows from that is discussed in the next section, because it is also where the overclaiming begins.
It is the same as Vodou
It is related and it is not the same, and the difference matters for both traditions.
Vodún is the religious system of the Fon and Ewe peoples of southern Benin, Togo and parts of southeastern Ghana, and the word means spirit or deity in Fon [S9]. Yorùbá òrìṣà religion is that of the Yorùbá-speaking peoples to the east. They are neighbours with long and dense interaction, and the interaction went in both directions: Dahomey was for a period a tributary of the Ọ̀yọ́ empire, which facilitated westward transfer of Yorùbá religious material into Fon and Ewe practice, so that in some respects the two have been described as at times indistinguishable or at least blurry [S9]. The pantheons overlap enough to be mutually recognisable, down to what is offered at an altar [S9].
They are still distinct traditions with distinct languages, distinct histories, distinct ritual structures and distinct institutional forms. Haitian Vodou is a further step removed again, formed in Saint-Domingue from Fon and Ewe material together with Kongo, Yorùbá and other West and Central African elements under conditions of French plantation slavery and Catholicism, and it is its own religion rather than a variant of either African parent. Louisiana Voodoo is different again.
The habit of collapsing all of these into one thing is mostly an artefact of the horror-film category "voodoo," which is not a religion at all but an American entertainment genre. Treating the Yorùbá case as a subdivision of it obscures both.
It is the same everywhere in the diaspora
It is not, and the differences are systematic rather than incidental.
Lucumí and Santería in Cuba, Candomblé in Brazil, Orisha religion in Trinidad and the twentieth-century North American Òrìṣà movements descend from Yorùbá practice, and each was shaped by conditions that differed. The proportion of Yorùbá to other African arrivals differed. The dominant colonial church differed, Catholic in Cuba and Brazil, Protestant in most of the Anglophone Caribbean and North America, which changed what forms of concealment and correspondence were available. The timing of abolition differed, which changed how much recent African-born knowledge was present at the point of consolidation. Urban and rural conditions differed. Legal status differed, with periods of active prohibition in some places and tolerance in others.
The results diverge in structure, not only in detail: which òrìṣà are central, how initiation is organised, what the ritual calendar looks like, how divination is done, what language is used liturgically and how much Yorùbá survives in it, and how the relationship to Catholicism is understood. Brazilian Candomblé is further internally divided into nations, of which Ketu is the Yorùbá-derived one, alongside Jeje and Angola lines with Fon and Kongo derivations.
There is also a live and sometimes sharp disagreement between continental and diaspora practitioners about authority and authenticity, particularly around initiation lineage and around what continental practice can validate. The diaspora section of this corpus treats each tradition on its own terms.
The overclaims: Egypt, computing, and antiquity
These run in the opposite direction from everything above, and they are corrected on the same standard.
That the Yorùbá came from Egypt
Olumide Lucas argued in The Religion of the Yorubas (1948) that Yorùbá religion derived from ancient Egyptian religion, adducing parallels in religious practice, funerary rites, names, sacred numbers, dress, emblems and language [S10]. The argument has been criticised on the ground that Lucas was trained as a theologian rather than as a linguist or ethnologist while relying on those disciplines to make his case, and on the ground that the parallels adduced are of a kind that occur widely and do not establish a specific connection [S10].
The evidence that is available points elsewhere. Historical linguistics places Yorùbá within Volta-Niger, itself within Niger-Congo, with Proto-Yorùbáoid reconstructed as spoken in the region of the Niger-Benue confluence in present-day Nigeria [S11]. Ògúndìran's synthesis of archaeology, linguistics, environmental science and oral tradition traces Yorùbá formation to the western side of that confluence around four thousand years ago, with rapid geographical expansion between roughly 300 BCE and 300 CE associated with a period of severe drought and with the adoption of iron metallurgy [S11]. That is a West African account grounded in West African evidence, and it is both better supported and considerably more interesting than the Egyptian one.
The reason the Egyptian claim persists is worth naming without contempt. It was formulated at a moment when African achievement was denied in principle, and attaching Yorùbá origins to a civilisation whose achievements Europe already conceded was a way of claiming standing within an argument whose terms had been set by others. Rejecting the claim does not require any sympathy with those terms. It requires only noticing that the terms have been abandoned and that the Yorùbá record stands on its own evidence.
That Ifá is the origin of binary or of computing
This one has a defensible core and an indefensible extension, and separating them is the whole task.
What is well supported: Ifá is genuinely binary in structure. Each of the eight positions in a cast resolves into one of two states, the resulting figure is one of 256, and each of those 256 Odù indexes a body of verse . That is a formally binary sign system used as a retrieval index over a large structured corpus, and it long predates the European formalisation of binary arithmetic. Eglash's African Fractals treats Ifá as among the most developed indigenous mathematical systems and identifies combinatorial reasoning in it centuries before Europe formalised the same reasoning . Longe's analysis identifies binary representation, Boolean algebra and memory addressing in the system . Formal algebraic characterisations of the Ifá codes have been published in the mathematical literature [S12]. Describing Ifá as an indigenous binary knowledge system, or as a decision-support system in which a coded output is mapped to narrative data and interpreted by a trained practitioner, is accurate .
What is not supported: that Ifá caused, influenced or is the origin of modern computing. Eglash proposed a transmission lineage running from African divination through Arab geomancy and European alchemy to Leibniz, and the evidence for that specific transmission is weak . Historians of mathematics working on Leibniz's binary have examined the proposed external influences on his invention of binary and found none of the candidates plausible, with the manuscript evidence showing no attention by Leibniz to alternative number systems prior to his development of binary, which is why the scholarly question has shifted to why Leibniz invented binary rather than from whom he got it . Careful writers on Ifá as a binary system make no origin claim: the LSE piece that describes Ifá as "not mystical, it's algorithmic" argues for recognition within a broader history of knowledge and for Ifá as an alternative ethical model for system design, and specifically does not claim Ifá as the origin of computing .
The distinction is worth holding precisely because the true version is stronger. "A West African oral tradition independently developed a formal binary sign system used to index a corpus of several hundred thousand verses, maintained without writing, centuries before Europe formalised binary arithmetic" is a remarkable and defensible claim. "Ifá invented the computer" is neither, and asserting it invites a rebuttal that then takes the true claim down with it.
That the tradition is older than it can be shown to be
Figures in the tens of thousands of years appear in popular accounts of Yorùbá antiquity and have no evidentiary basis. What the archaeological record supports for the deep past is set out in the history section of this corpus with dated ranges and stated confidence levels. Ògúndìran's reconstruction places Yorùbá formation at roughly four thousand years before the present, which is a serious antiquity established by evidence, and inflating it does not improve it.
The pattern
The hostile distortions and the celebratory overclaims share a method: both assert a conclusion first and treat evidence as decoration. Both also make the same practical mistake, which is that they make the actual material harder to see. The demonic version prevents a reader from encountering Ifá as a formal system. The Egyptian and computing versions prevent a reader from encountering it as a West African one. The material is more interesting than either, and the only way to reach it is to hold every claim to the evidence, including the ones you would prefer to be true.
Sources
- [1]On Crowther's translation of Satan as Èṣù, the 1843 Yorùbá grammar and vocabulary and the 1884 complete Yorùbá Bible: see the file on the demonization in this section and the history section file on Christianity, Islam and colonial conquest, both of which carry the primary sourcing, including Wikipedia, "Samuel Ajayi Crowther," https://en.wikipedia.org/wiki/Samuel_Ajayi_Crowther , and the Dictionary of African Christian Biography, https://dacb.org/stories/nigeria/crowther4-samajayi/
- [2]Bọ́sẹ̀dé Adéfiọlá Adébọ̀wálé, "'The Devil': Hermes and Èṣù in Ancient Greek and Yorùbá Traditional Religions," https://www.researchgate.net/profile/Bosede-Adebowale-2/publication/354598937 ; "Esu: The Misunderstood god of Yoruba Religion," Book Buzz Foundation on Google Arts & Culture, https://artsandculture.google.com/story/esu-the-misunderstood-god-of-yoruba-religion-book-buzz-foundation/FAVBDro2hfg8vA . For the comparison to the Satan of the Book of Job as a figure assigned the testing of faith rather than an adversary of God, and the statement that the Yorùbá pantheon has no evil gods: "Yoruba Religion and Myth," Postcolonial Web, https://www.postcolonialweb.org/nigeria/yorubarel.html
- [3]E. Bọ́lájí Ìdòwú, Olódùmarè: God in Yoruba Belief (Longmans, 1962), for diffused monotheism and for Ọlọ́dùmarè as transcendent, without temples, priests or sacrifice. https://en.wikipedia.org/wiki/Olodumare:_God_in_Yoruba_Belief ; https://en.wikipedia.org/wiki/Diffused_monotheism . For the critique that the reading imports a Christian frame: Benson O. Igboin, "Is Olodumare, God In Yoruba Belief, God?", https://www.researchgate.net/publication/295833540 ; John A. I. Bewaji, "Olodumare: God in Yoruba Belief and the Theistic Problem of Evil," https://www.researchgate.net/publication/265032359 . Confidence: contested.
- [4]UNESCO, "Ifa divination system," Representative List of the Intangible Cultural Heritage of Humanity, inscribed 2008 (proclaimed 2005). https://ich.unesco.org/en/RL/ifa-divination-system-00146 . Quoted: "an extensive corpus of texts and mathematical formulas"; "The Ifa literary corpus, called odu, consists of 256 parts subdivided into verses called ese, whose exact number is unknown as they are constantly increasing (there are around 800 ese per odu)."
- [5]Ọ. A. Olanipekun, "Omoluabi: Re-thinking the Concept of Virtue in Yoruba Culture and Moral System," Journal of Pan African Studies vol. 10 no. 9, https://philarchive.org/archive/OLAMJA-2 , for the virtue list and the characterisation of ọmọlúàbí. On ìwà as the criterion of moral worth, the relational and cosmological orientation of ìwà pẹ̀lẹ́, and the comparison to virtue ethics: "Ìwà-Pẹ̀lẹ́: The Yoruba Ethic Of Good Character In Ifá," https://ileifa.org/iwa-pele-yoruba-ethic-good-character-ifa/ . The cosmology section of this corpus carries the treatment with primary Ifá texts.
- [6]J. D. Y. Peel, Religious Encounter and the Making of the Yoruba (Indiana University Press, 2000). https://iupress.org/9780253215888/religious-encounter-and-the-making-of-the-yoruba/ ; https://archive.org/details/religiousencount0000peel . Source for the argument that Yorùbá ethnic self-consciousness was formed in the mid-nineteenth-century missionary encounter, and for the account of why conversion accelerated during the wars.
- [7]Robin Law, "Human Sacrifice in Pre-Colonial West Africa," African Affairs 84, no. 334 (January 1985), pp. 53-87, https://academic.oup.com/afraf/article/84/334/53/53107 , the standard treatment, including the point that European observers from the fifteenth century emphasised and exaggerated the practice to define Africans as barbaric and justify conquest. Olatunji Ojo, "Slavery and Human Sacrifice in Yorubaland: Ondo, c. 1870-94," The Journal of African History 46, no. 3 (2005), pp. 379-404, DOI 10.1017/S0021853705000472, https://www.cambridge.org/core/journals/journal-of-african-history/article/slavery-and-human-sacrifice-in-yorubaland-ondo-c-187094/0119E2EB395E645CCF72F7AE83F0A5CF , for the Yorùbá case, its relation to economic inequality and chiefly privilege, and the conflict over its abolition. Both articles are paywalled and the summaries here rest on published abstracts and secondary accounts; confidence: medium.
- [8]On Ifá as a binary knowledge system, with the caveats: Uyiosa Omoregie, "What Ifá, an Indigenous binary knowledge system can teach us about AI," LSE Impact of Social Sciences blog, 22 August 2025, https://blogs.lse.ac.uk/impactofsocialsciences/2025/08/22/what-ifa-an-indigenous-binary-knowledge-system-can-teach-us-about-ai/ , source of "It's not mystical, it's algorithmic," of the description of Ifá as a decision-support system mapping a coded output to narrative data interpreted by a trained practitioner, and of the summaries of Ron Eglash and Olu Longe. Ron Eglash, African Fractals: Modern Computing and Indigenous Design (Rutgers University Press, 1999), for the treatment of Ifá as an advanced indigenous mathematical system and for the proposed transmission lineage through Arab geomancy to Europe. On the weakness of the evidence for that specific transmission, see the discussion at https://thedreamvariation.blogspot.com/2014/02/eglash-on-african-fractals-architecture.html and
- [13]below. [S9] Wikipedia, "West African Vodún," https://en.wikipedia.org/wiki/West_African_Vod%C3%BAn , on Vodún as the religion of the Fon and Ewe of southern Benin, Togo and southeastern Ghana, on the meaning of the word in Fon, on Dahomey's period as a vassal of Ọ̀yọ́ and the consequent westward transfer of Yorùbá religious material, and on the resulting overlap described as at times indistinguishable or blurry. Britannica, "Vodou," https://www.britannica.com/topic/Vodou , on Haitian Vodou's formation in Saint-Domingue. [S10] Olumide Lucas, The Religion of the Yorubas, Especially in Relation to the Religion of Ancient Egypt (C.M.S. Bookshop, Lagos, 1948). https://www.academia.edu/33327412/ ; https://en.wikipedia.org/wiki/Olumide_Lucas . On the criticism that Lucas was trained as a theologian rather than as a linguist or ethnologist while relying on those disciplines, and that the adduced parallels are of a widely occurring kind that does not establish specific connection, see the discussion of R. W. Wescott's response in the same sources and in Jonathan Agai, "Reflection on the theory of the Arab origin of the Yoruba people," Theologia Viatorum, https://theologiaviatorum.org/index.php/tv/article/view/77/202 [S11] Wikipedia, "Proto-Yoruboid language," https://en.wikipedia.org/wiki/Proto-Yoruboid_language , on the classification within Volta-Niger and the reconstructed homeland at the Niger-Benue confluence. Akínwùmí Ògúndìran, The Yorùbá: A New History (Indiana University Press, 2020), https://iupress.org/9780253051493/the-yoruba/ , and the author's own summary at https://theconversation.com/a-long-view-sheds-fresh-light-on-the-history-of-the-yoruba-people-in-west-africa-162776 , for the account of formation on the western side of the confluence around four thousand years ago and expansion between roughly 300 BCE and 300 CE associated with drought and iron metallurgy. [S12] "Algebraic characterization of Ifa main divination codes," Scientific African / ScienceDirect, https://www.sciencedirect.com/science/article/pii/S2468227623001850 . Cited here as evidence that formal algebraic treatment of the Ifá codes exists in the mathematical literature; the full text was not accessible for verification of its specific results, so no particular result is attributed to it. Confidence: medium. [S13] Lloyd Strickland, "Why Did Leibniz Invent Binary?", https://e-space.mmu.ac.uk/632362/ , and Lloyd Strickland and Harry R. Lewis, Leibniz on Binary: The Invention of Computer Arithmetic (MIT Press, 2022), ISBN 9780262544344, https://mitpress.mit.edu/9780262544344/leibniz-on-binary/ . The position reported here is that historians of mathematics have found none of the proposed candidates for an external influence on Leibniz's invention of binary to be plausible, that the manuscript evidence shows no attention by Leibniz to alternative number systems prior to his development of binary, and that the scholarly question has consequently shifted to why he invented it. The full text of the Strickland paper was not retrieved directly; this summary rests on the published abstract and on secondary reporting of it. Confidence: medium.