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.
Oyo Empire preventing the Alaafin from being an autocrat; the Oyo Mesi compelled many Afaafin to commit suicide during the 17th and 18th centuries. The head of the council of Oyo Mesi, the Bashorun, consulted the Ifa oracle for approval from the gods. New alaafins of Oyo were seen as appointed by the gods. They were regarded as "Ekeji Orisa," meaning "companion of the gods." The Bashorun had final say on the nomination of the new Alaafin, his power rivaling the king himself. For example, the Bashorun orchestrated many religious festivals; in addition to being commander-in-chief of the army, which gave him