The Yoruba-speaking political complex stretched across a broad zone from Atakpame in the west to Owo in the east, and from Ijebu and Ode Itsekiri in the south to Oyo in the north. Its states were generally small, often consisting of a single town and its surrounding villages. Ekiti alone contained no fewer than sixteen or seventeen kingdoms in recent centuries, while Egba and Ijebu formed federations of smaller states rather than centralized kingdoms.

Ife occupied a privileged place in Yoruba traditions. Legends of Oduduwa and his descendants present Ife as the first Yoruba state and as the source of several later dynasties. Archaeological dates from charcoal at Ita Yemo, ranging from approximately 960 to 1160, are earlier than those recorded for other urban Yoruba sites and lend support to the antiquity of Ife, although the evidence remains limited.

The political importance of Ife should not obscure the diversity of Yoruba state formation. Claims of Ife ancestry could be shaped by conquest, dynastic installation, or the prestige attached to a powerful and distant origin. The text therefore treats oral traditions cautiously, noting that the order and manner in which the Yoruba states emerged remain imperfectly known.

Oyo was the striking exception to the predominantly small-scale political organization of the Yoruba region. Its imperial character developed relatively late, perhaps in the early seventeenth century, in a savannah environment that favored movement, cavalry, and the deployment of large armies. Oyo was influenced by neighboring Borgu and Nupe and first had to establish itself against northern rivals before turning toward conquest among the forest Yoruba.

A founding date early in the fifteenth century has been proposed for the Oyo kingdom on the basis of its king-list. Nupe pressure forced the abandonment of the capital in the second quarter of the sixteenth century, and Oyo later reorganized its military forces before returning to the capital around the end of that century. These developments show how ecological conditions and relations with savannah states shaped the later expansion of Oyo.