The IWAMURA clan was an immigrant-based samurai-warrior descendants who took root in Hekikai County in Mikawa Province, and this clan, together with the SAKANOUE clan, belonged to the HIGASHIKAN clan (WAKAN clan).
石村氏は、三河国碧海郡に定着した渡来系氏族で、坂上氏とともに東漢氏（倭漢氏）に属した。