1. The Ooni of Ife: He is considered the most revered king in Nigeria. He is the traditional ruler of the Yoruba people.
2. Alaafin of Oyo: Historically, one of the most powerful rulers in Yoruba land, the Alaafin of Oyo is selected by a council of chiefs known as the Oyomesi.
3. The Oba of Benin: One of Nigeria's most respected monarchs, the current Oba of Benin is Oba Ewuare (ascended in 2016).
4. The Sultan of Sokoto: The Sultan of Sokoto is the spiritual leader of Muslims in Nigeria and the head of the Sokoto Caliphate.