Mitsusue's grandson (or son, younger brother of Sadamune) MINAMOTO no Hisanao performed well on the Genpei War and became a jito (manager and lord of manor) of Kamachi, Mizuma County, Chikugo Province, as a Chinzei vassal of the Kamakura bakufu (Japanese feudal governmend headed by a shogun), and began to use the family name of Kamachi.
孫（あるいは子。貞宗の弟）の源久直が源平合戦の功により鎌倉幕府の鎮西御家人として筑後国三潴郡蒲池の地頭となり蒲池氏を氏とする。