History of Nigeria city-states. A state council (the "Oyo Mesi") named the "Alaafin" (king) and acted as a check on his authority. Their capital city was situated about 100 km north of present-day Oyo. Unlike the forest-bound Yoruba kingdoms, Oyo was in the savanna and drew its military strength from its cavalry forces, which established hegemony over the adjacent Nupe and the Borgu kingdoms and thereby developed trade routes farther to the north. The Benin Empire (1440–1897; called "Bini" by locals) was a pre-colonial African state in what is now modern Nigeria. It should not be confused with the modern-day country called Benin,
Nupe people Nupe people The Nupe, traditionally called the Tapa by the neighbouring Yoruba, are an ethnic group located primarily in the Middle Belt and northern Nigeria, and are the dominant group in Niger State, an important minority in Kwara State and present in Kogi State as well. The Nupe trace their origin to Tsoede who fled the court of Idah and established a loose confederation of towns along the Niger in the 15th century. The proximity of Nupe to the Yoruba Igbomina people in the south and to the Yoruba Oyo people in the southwest led to cross-fertilization of cultural influences