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
Islam in Nigeria built in Ọyọ-Ile in AD 1550 although, there were no Yoruba Muslims, the Mosque only served the spiritual needs of foreign Muslims living in Ọyọ. Progressively, Islam came to Yoruba land, and Muslims started building Mosques: Iwo town led, its first Mosque built in 1655 followed by Iṣẹyin, in 1760; Lagos, 1774; Ṣaki, 1790; and Oṣogbo, 1889. In time, Islam spread to other towns like Oyo (the first Oyo convert was Solagberu), Ibadan, Abẹokuta, Ijẹbu-Ode, Ikirun, and Ẹdẹ before the 18th century Sokoto jihad. Several factors contributed to the rise of Islam in Yoruba land by mid 19th century. Before