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 origin of human civilization, remains intact to this day. The urban phase of Ile-Ife before the rise of Oyo, c. 1100–1600, a significant peak of political centralization in the 12th century) is commonly described as a "golden age" of Ile-Ife. The oba or ruler of Ile-Ife is referred to as the Ooni of Ife. Ife continues to be seen as the "Spiritual Homeland" of the Yoruba. The city was surpassed by the Oyo Empire as the dominant Yoruba military and political power in the 17th century. The Oyo Empire under its oba, known as the Alaafin of Oyo, was active