Ife was surpassed by the
Oyo Empire as the dominant Yoruba military and political power between 1600 and 1800 AD. The nearby
Benin Empire was also a powerful force between 1300 and 1850. Oyo developed in the 17th century and become one of the largest Yoruba kingdoms, while Ile-Ife remained as a religiously significant rival to its power at the site of the divine creation of the earth in Yoruba mythology. After Oduduwa's ascension in Ile-Ife, he had a son. This son later became the first ruler of the Oyo empire. The Oyo kingdom subjugated the kingdom of
Dahomey. It traded with European merchants on the coast through Ajase. The wealth of the empire increased, and its political leader's wealth increased as well. This state of affairs continued until Oba Abiodun, Oyo's last great ruler, engaged his opponents in a bitter civil war that had a ruinous effect on economic development and the trade with the European merchants. The downfall of the kingdom came soon after, as Abiodun became concerned with little other than the display of royal wealth. Oyo's empire had collapsed by the 1830s. Like Oyo itself, most of the surrounding city states were controlled by
Obas, elected priestly monarchs, and councils made up of
Oloyes, recognised leaders of royal, noble, and often even common descent, who joined them in ruling over the kingdoms through a series of guilds and cults. Different states saw differing ratios of power between the kingship and the chiefs' council. Some, such as
Oyo, had powerful, autocratic monarchs with almost total control, while in others such as the
Ijebu city-states, the senatorial councils were supreme and the Ọba served as something of a figurehead. In all cases, however, Yoruba monarchs were subject to the continuing approval of their constituents as a matter of policy, and could be easily compelled to abdicate for demonstrating dictatorial tendencies or incompetence. The order to vacate the throne was usually communicated through an
àrokò or symbolic message, which usually took the form of
parrots' eggs delivered in a covered calabash bowl by the Oloyes. ==Modern history==