City and capital of Oyo State, 85 mi NE of Lagos. Founded in the 1830s as a military camp during the Yoruba civil wars, it later became the most powerful Yoruba city-state. In 1840 forces from the city defeated Fulani invaders from the north at the battle of Oshogbo. Ibadan came under British protection
in 1893 and shared in the gradually increasing independence of Nigeria.