Oyo Empire metropolitan Oyo. This may have been fine in the 15th century when Oyo controlled only its heartland. But to make and maintain farther conquest, the structure underwent several changes. Oyo maintained a semi-standing army of specialist cavalry soldiers called the "Eso", the "Esho" or, formally, the Eso of Ikoyi. These were 70 junior war chiefs who were nominated by the Oyo Mesi and confirmed by the Alaafin of Oyo. The Eso were appointed for their military skill without regard to heritage and were led by the Are-Ona-Kakanfo. After Oyo's return from exile, the post of Are-Ona-Kakanfo was established as the
Yoruba people by a significant proportion of the populations of Nigeria, Benin and Togo. The Yoruba faith, variously known as Aborisha, Orisha-Ifa or simply (and erroneously) Ifa, is commonly seen as one of the principal components of the African traditional religions. Orisa'nla, also known as Ọbatala, was the arch-divinity chosen by Olodumare, the Supreme God, to create solid land out of the primordial water that then constituted the earth and populating the land with human beings molded out of clay. The Yorùbá religion comprises the traditional religious and spiritual concepts and practices of the Yoruba people. Its homeland is in Southwestern Nigeria