It is important to mention the historical and cultural link between Erin-Ijesa and Ilesa as regards the Iro and Olumirin. Although, Ilesa is the central and major city in Ijesaland, but significant portion of Ilesa’s royal tradition is owed to Erin-Ijesa.
The story goes thus: An Alaafin of Oyo, sometimes in the 16th century, sent his pretty barren daughter called Yeyesaro accompanied by her sister Yeyedere to take a sacrifice to Erin-Ijesa after due consultation with Ifa oracle. The sacrifice is to be placed at the foot of Aagba tree in the popular Oyingbo-Mekun market of Erin-Ijesa. Ifa also directed that Yeyesaro should marry the first man whose two eyes first met with hers. The party traced their way to Ilesa and told the Owa (King) of Ilesa, Obarabaralokunesin who then lived at Ibokun of their mission. The Owa accorded them royal welcome and led them to Imo, where he went back having shown them the way to Erin-Ijesa. Upon arrival at Erin-Ijesa, Yeyesaro went straight to perform the ritual at the foot of Aagba tree as directed; and a man called Onisunmbe suddenly emerged and challenged her. The woman narrated her story and mission to him. Onisunmbe could not resist her beauty and royal look; and thereafter invited her and her sister to his house. The woman conceived and bore a male child for Onisunmbe within a short time. Her sister, Yeyedere, thereafter left for Ijebu-Jesa where she got married to the Ogboni (King) of Ijebu-Jesa to whom she too bore a son. Yeyesaro was not quite happy marrying Onisunmbe, a commoner in Erin, unlike her sister that married a king. She therefore left Onisunmbe to marry the Owa of Ilesa, Obarabaralokunesin; where she gave birth to a prince who later became the Owa-Obokun Owaluse of Ilesa. Thus, Owaluse became half-brother to the son of Onisunmbe of Erin-Ijesa. When Onisunmbe died and Owaluse had cause to attend his half-brother father’s burial, he was astonished and dumb-founded by the supernatural performance of Iro priest (Lowabisi) who conducted the ceremony to the extent that he fell into a trance. Upon recovery from trance, he pleaded with his half-brother that whenever he died, Lowabisi should be invited to accord him the type of befitting ceremony he had watched at Erin-Ijesa. He also charged his people that followed him from Ilesa to ensure this was done, and they pledged on oath to do this.
When Owa Obokunobarabaralokunesin died at Ibokun, he was succeeded by Owaluse. But Owari usurped the throne from Owaluse and ruled the Ijesa from his headquarters at Ipole. Owaluse sought refuge in Oyo, his mother’s town, during this period. The Ijesas abhorred Owari’s reign and he was later tricked to commit suicide, and was buried at Ipole. Owaluse was invited from Oyo, after the death of Owari, to become Owa Obokun with his seat of government at Ilesa. He was the second Owa Obokun to govern directly from Ilesa, the first being Owara Okile.
Upon the death of Owaluse, who reigned between 1522 and 1526, his relatives did not accord him the type of burial that he requested; hence tragic and sad events befell Ilesa which ranges from devastating storms that rendered people homeless and maimed, several sudden deaths of both old and young, influential and powerful people; and fear gripped the people. The chiefs went to consult Ifa oracle which confirmed that Owaluse’s relatives failed to fulfill the pledge they made to him. It was at this juncture that it was revealed that the rituals performed at Onisumbe’s burial in Erin-Ijesa should be performed in honour of Owaluse as he once demanded before peace and calm could return to Ilesa. The regent, Chief Obanla of Ilesa, conferred with other chiefs and sent emissaries to the Akinla and requested him to invite Owaluse’s relatives in his domain to perform burial ceremonies of Owaluse to avert further disasters. Lowabisi, the Iro priest, led the Onisunmbe family to perform the rituals and drove out evil spirits and other harmful things in the palace and other strategic places of Ilesa.
History has it that from Owa Obokun Atakunmosa to Owa Obokun Waiye, the tradition was kept and they enjoyed their reigns. After them followed eight successive Owa who either died in Ogboni’s house within three months or shortly after getting to the throne because they set aside the tradition. This caused the Owa, who was a female, a great worry and panic that she inquired why her predecessors’ reign was so short and uneventful. A man in Ogboni’s house told her that her predecessors neglected certain tradition to their perils. She therefore resuscitated the tradition which led to her long reign. That ancient rite and ritual has continued till today as clear evidence of the cultural and historical bond between Erin-Ijesa and Ilesa.
Tradition also has it that Owa does not drink water from Erin-Ijesa. Therefore, when in early 1930’s the Regional Government decided to provide pipe-borne water for Ilesa with Erin-Ijesa waterfalls as the source of supply, the Owa of Ilesa objected to the plan because it was against the traditional belief of his area. The source was later changed to Efon Alaiye.