 Sadamori was an ancestor of the Hōjō clan which wielded considerable political power several centuries later, during the Kamakura period; his fourth son, Taira no Korehira, was the progenitor of the Ise Taira branch family.In 935, while Sadamori held the post of "Samanojō" (deputy horseguard), his father was killed by Taira no Masakado, in an uprising.Sadamori and Fujiwara no Hidesato pursued and faced Masakado, killing him in the 940 battle of Kojima.