Mamori also could not retrieve the clan's influence because the Southern House of the Fujiwara clan, who had a close relationship to his great-grandfather ISHIKAWA no Iwatari and his grandfather ISHIKAWA no Toshitari, also lost their power due to the Rebellion of Fujiwara no Nakamaro.
彼も例外ではなく、曽祖父の石川石足・祖父の石川年足と深く結びついていた藤原南家も藤原仲麻呂の乱により衰退してしまった事もあり、勢いを取り戻す事は叶わなかった。