Military republic of Oyo refugee war-chiefs that halted the Ilorin jihad at Osogbo and became the dominant power in 19th-century Yorubaland.
Ibadan's hegemony was broken by the Ekitiparapo revolt and the 16-year Kiriji war, closed by the Governor of Lagos's arbitrated peace treaty of 25 June 1886; by the Agreement of 15 August 1893 the Bale and authorities of Ibadan accepted British protection, and Ibadan passed into the Lagos Protectorate and later Nigeria.
The foundational insider narrative of Ibadan's rise, its war chiefs and its 1893 submission, by a Yoruba clergyman who lived through the last of the wars.
The standard monograph on exactly this polity and period — how a war camp financed and governed an empire.