According to oral tradition, Orosun was a woman and that she was one of the wives of Olofin Aremitan. When Olofin left Ife and got to Ipetu Ijesha where he stayed briefly, he met Orosun who was said to be very beautiful. Aremitan married her at Ipetu. After some years Aremitan left for Oke-Idanre which he founded. Because of the strong tie between Olofin and Orosun she came to Idanre where she was welcomed to the palace. She stayed in the palace for many years but unfortunately, her marriage was not blessed with any issue. Her position in the palace was enviable. She was held in high esteem by the King to the annoyance of other wives. This developed into a domestic intrigue and Orosun fled the palace and entered into a cave near the present Orosun Hill. The people of Idanre decided thereafter to appease her in exchange for fertility, peace, progress and health. She is worshipped every year. The festival is performed on 15th May of every year.