His father Yoshikane often fought with his cousin TAIRA no Masakado, and when he beat Masakado and captured and abducted Masakado's wife and children to Shimousa province, Kinmasa and his elder brother Kintsura let them go to Masakado.
父良兼らが従兄弟の、平将門と度々争い、勝利して将門の妻子を捕らえ上総に拉致すると、弟の公連と共にこれを将門の許に逃がしたとされる。