Oyo Empire 17th century, Oyo began a long stretch of growth, becoming a major empire. Oyo never encompassed all Yoruba-speaking people, but it was the most populous kingdom in Yoruba history. The key to Yoruba rebuilding of Oyo was a stronger military and a more centralized government. Taking a cue from their Nupe enemies (whom they called "Tapa"), the Yoruba rearmed with armor and cavalry. Oba Ofinran, Alaafin of Oyo, succeeded in regaining Oyo's original territory from the Nupe. A new capital, Oyo-Igboho, was constructed, and the original became known as Old Oyo. The next oba, Eguguojo, conquered nearly all of Yorubaland.
Old Oyo National Park ancient political capital of Oyo Empire of the Yoruba people, and contains the ruins of this city. Oyo Ile was destroyed in the late 18th century by Ilorin and Hausa/Fulani warriors at the culmination of the rebellion of Afonja, commander of Oyo Empire's provincial army for which he allied himself with Hausa/Fulani Muslim jihadists. The national park originated in two earlier native administrative forest reserves, Upper Ogun established in 1936 and Oyo-lle established in 1941. These were converted to game reserves in 1952, then combined and upgraded to the present status of a national park. The park covers 2,512 km,