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The term Loa (Lwa), the Vodou term for their Gods, seems at once to derive from the Yoruba term oluwa, or ‘lord’, and from the French loi, law, a providential semantic convergence, because each Loa is at once a primordial lord of being, and also provides a law, or organizing principle, for the cosmos. The Loa are also ‘ancestors’, because this is how They are taken up into or appropriated by the mortal individual. That is, They are not ‘ancestors’ in the mundane sense, but rather express a sense of ancestrality inseparable from the process by which mortal beings actualize themselves. Experiencing the Gods as ancestors establishes Them within a material continuum which is local and intimate, but also renders Them fully portable, ensuring that They were brought along with the enslaved, within their very bodies, whatever other ties had been broken, and allowing the Gods to form the basis for new family and community structures in their place. Hence in Dahomey, whence the core elements of Vodou theology are derived, there is a hypostasis of the God Legba born with and dying with the individual, a personal Legba.
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Edward P. Butler (The Way of the Gods : Polytheism(s) Around the World)