When Amaterasu challenged Susanoo to prove his good faith at Amanomanai (the 'ukei' of Amaterasu and Susanoo), five male and three female deities were produced from Susanoo's sword (the female deities are collectively called Munakata Sanjoshin), and Ichikishimahime is one of them.
アマテラスとスサノオが天真名井で行った誓約（アマテラスとスサノオの誓約）の際に、スサノオの剣から生まれた五男三女神、(うち、三女神を宗像三女神という）の一柱である。