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,
Shaki, Oyo Shaki, Oyo Shaki (also Saki) is a town situated in the northern part of Oyo State in western Nigeria. The terrain is hilly. The town lies near the source of the Ofiki River, the chief tributary of the Ogun River, about 40 miles (60 km) from the Benin border. It is referred to as the food basket of Oyo State because of its agricultural activities. It is the headquarters of Saki West local government authority. Originally part of the Oyo Empire, Shaki became a Yoruba refugee settlement after the destruction in 1835 of Old Oyo (Katunga), 70 miles (113 km)