Thus the Iwahashi clan (Suketane described himself as an illegitimate child of Yasutane MAKUWARI), who owned the area around Iwahashi Village, Into-sho (manor) (present-day Shisui Town, Inba District, Chiba Prefecture), claimed that they were the head of the Chiba clan.
そのため、印東庄岩橋村（現在の千葉県印旛郡酒々井町）付近を領有した岩橋氏（輔胤は馬加康胤の庶子を自称）が千葉氏当主を自称した。