Largest Yoruba-speaking state; prominent from the late 16th to the early 18th century; Dahomey under its sway; founded in tradition by Oranmiyan, first Alaafin; Ilorin's secession from 1793; Oyo-Ile destroyed by Ilorin in 1835; capital moved south to Ago d'Oyo under Atiba (d. 1859). Accessed 2026-10-02.