History of Africa usually governed by an "oba" and an "iwarefa", a council of chiefs who advised the "oba." by the 18th century, the Yoruba city-states formed a loose confederation, with the "Oni" of Ife as the head and Ife as the capital. As time went on, the individual city-states became more powerful with their "obas" assuming more powerful spiritual positions and diluting the authority of the "Oni" of Ife. Rivalry became intense among the city-states. The Oyo Empire rose in the 16th century. The Oyo state had been conquered in 1550 by the kingdom of Nupe, which was in possession of cavalry,
Oyo, Oyo Oyo, Oyo Oyo is a city in Oyo State, Nigeria, founded as the capital of the Oyo Kingdom in the 1830s and known to its people as 'New Oyo' (Ọyọ Atiba) to distinguish it from the former capital to the north, 'Old Oyo' (Ọyọ-Ile), which had been deserted as a result of rumors of war. Its inhabitants are mostly of the Yoruba people, and its ruler is the imperial majesty Alaafin of Oyo. The major market in the city is Akeesan market, also called Oja Oba (King's market) its very close to the Alaafin's Palace, which is opened on a