History of Orosun: Oral history records that Orosun travelled down to Ikori (in Akoko area) where she met and fell in love with Olofin Aremitan, the founder of Idanreland. Orosun was one of the many wives of Olofin Aremitan.
From Ikori, she went with Olofin to Utaja (in Idanre). Subsequently, Orosun went to Akoko to collect her belongings so that she could return to Idanre to settle down with Olofin as his spouse. However, before she returned, Olofin unfortunately passed away and the people had moved to Oke-Idanre. Orosun followed the Idanre people to Oke Idanre and eventually became espoused to Agboogun.
During the reign of Owa Baganju, Orosun, the beautiful lover of Olofin Aremitan returned to Ufe-Oke from Ikori her hometown to resume her relationship with Olofin Aremitan, only to find out that Olofin had passed away. Orosun remained in Ufe-Oke (which was later renamed Idanre) and eventually married Owa Baganju.
Orosun was generally loved by Idanre people owing to her love for children despite not having one herself (she had offered her only child as a human sacrifice whilst in Ile-Ife). She was known as a healer of sorts, often cooking herbs with her ‘Ikoko Aremo’ to cure children of their illnesses. At some point, perhaps as a result of political intrigue, Orosun became the target of communal hatred and she was eventually assassinated at the foot of the highest hill in Idanre.
After her death, the people consulted the Ifa Oracle who revealed that Orosun had being unjustly treated and the oracle mandated that Orosun be given a proper burial ceremony, be deified and sacrifices be offered to her annually. The highest mountain in Idanre, at the foot of which she reportedly died, is named after Orosun and the festivals continue to be held in her honour yearly.