This clan originated with descendants of Prince Shikisen and Prince Koga (grandchildren of Emperor Koko), who were given the honorary surname of Taira no Ason upon being demoted from the Imperial family.
光孝天皇の孫・式膽王及び興我王の子孫が平朝臣を賜姓されて臣籍に下ることによって成立した氏族。