Oyo Empire culture in Oyo where victory was obligatory and defeat carried the duty of committing suicide. This do-or-die policy no doubt contributed to the military aggressiveness of Oyo's generals. The Oyo Empire was the only Yoruba state to adopt cavalry; it did so because most of its territory was in the northern savannah. The origin of the cavalry is disputed; however, the Nupe, Borgu and Hausa in neighboring territories also used cavalry and may have had the same historical source. Oyo was able to purchase horses from the north and maintain them in metropolitan Oyo because of partial freedom from the
Yoruba people others. These varieties, or spiritual lineages as they are called, are practiced throughout areas of Nigeria, the Republic of Benin, Togo, Brazil, Cuba, Guyana, Haiti, Jamaica, Puerto Rico, Suriname, Trinidad and Tobago, the United States, Uruguay, Argentina and Venezuela, among others. As interest in African indigenous religions grows, Orisha communities and lineages can be found in parts of Europe and Asia as well. While estimates may vary, some scholars believe that there could be more than 100 million adherents of this spiritual tradition worldwide. Oral history of the Oyo-Yoruba recounts Odùduwà to be the Progenitor of the Yoruba and the