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 al-Salih into his ranks. By doing this, he hoped to secure the support of Yoruba Muslims and volunteers from the Hausa-Fulani north in keeping Ilorin independent. Torn by internal struggle, Oyo could not defend itself against the Fulani. Oyo-Ile was razed by the Fulani Empire in 1835 and the Oyo Empire collapsed in 1836. To this day, the Illorin traditional ruler is an emir, whereas in the rest of Yoruba towns the rulers are called "oba" or "baale" (Baale or Baba Onile meaning "father of the land" or "lord of the land"). After the destruction of Oyo-Ile, the capital was