The son of Mitsumasa IGA, Yamashiro no kuni Kokushi (Governor of Yamashiro Province), who was the Ossotonin (the head of legal institutions of Kamakura bakufu [Japanese feudal government headed by a shogun] and Muromachi bakufu) in the Rokuhara Tandai (an administrative and judicial agency in Rokuhara, Kyoto).
六波羅探題越訴頭人であった山城国国司伊賀光政の子。