Alaafin Adeyemi, the III from the Alowodu Ruling House, died at the Afe Babalola University Teaching Hospital in Ado Ekiti in the late hours of Friday.
In the early hours of Saturday, the remains of the top Yoruba traditional ruler were brought to Oyo, and traditional rites began.
He was 83 years old and had ruled for 52 years, making him the longest reigning Alaafin in history.
Alafin Adeyemi promised to celebrate his 84th birthday in Ghana with the Isokan Yoruba festival in Ghana, of which he was the patron.
After receiving the word of the monarch’s death from the Bashorun of Oyo, Yusuf Akinade, who would now oversee Oyo until a new Alaafin is installed, the Governor of Oyo State, Seyi Makinde, is anticipated to make an official declaration.