According to Yoruba History, and also odu ifa, the following are the children of Oduduwa who created Yoruba Land.
1. Oranyan of Oyo
2. Olowu of Owu (son of Oduduwa's daughter),
3. Alaketu of Ketu (son of a princess),
4. Oba of Benin,
5. Oragun of Ila,
6. Onisabe of Sabe,
7. Olupopo of Popo,
8. Owa Obokun of Ijesaland
The youngest of them is Owa Obokun of Ijeshaland while Oranmiyan of Oyo was the eldest. History of the blindness of Oduduwa led to the dispersal of his children to become kings over Yoruba land. Owa Obokun the youngest was not with Oduduwa when his brothers left. He was far away fetching sea water (omi okun) to cure Oduduwa’s blindness- hence the title of Obokun – He is originally Adimula – his children spread to Ekiti land and till today , Deji of Akure continually pay homage to Owa Obokun as one of his sons.  Same as Ataoja of Oshogbo.

While all of his brothers had gone with Oduduwa’s crowns, none was left for him. But he was given a sword called Ida Ajase. He eventually caught up with one his brothers and fought to  win a crown for himself. That was the only crown in Yorubaland that has no facial coverage, because it was cut off at war. 

Ooni inherited the crown from Oduduwa after his death. That is why  he was given recognition by the rest of the children of Oduduwa, because he took care of Ife and became king after the death of Oduduwa.

Sabe and Popo are not in Nigeria teritory  today. The Yorubas hold the secret of the origin of black people.