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 Atlantic world domains, the Yorubas were known by the designations: "Nagos/Anago", "Terranova", "Lucumi" and "Aku", or by the names of their various clans. The Yoruba left an important presence in Cuba and Brazil, particularly in Havana and Bahia. According to a 19th-century report, "the Yoruba are, still today, the most numerous and influential in this state of Bahia. The most numerous are those from Oyo, capital of the Yoruba kingdom". Others included Ijexa (Ijesha), Lucumi Ota (Aworis), Ketus, Ekitis, Jebus (Ijebu), Egba, Lucumi Ecumacho (Ogbomosho), and Anagos. In the documents dating from 1816 to 1850, Yorubas constituted 69.1% of all