It is said that Koteko's son, Prince Hachiko, escaped from the capital at the discretion of Prince Umayado (Prince Shotoku), and became the founder of Dewa Sanzan (Three Sacred Mountains of Dewa) in Tsuruoka City, Yamagata Prefecture.
小手子の子、蜂子皇子は厩戸皇子（聖徳太子）の計らいで京を逃れ、山形県鶴岡市の出羽三山の開祖となったと伝えられる。