MINAMOTO no Hisanao of Saga Genji (Minamoto clan), who became Saigoku gokenin (immediate vassals of the shogunate of the western part of Japan in the Kamakura and Muromachi through Edo periods) of the bakufu (Japanese feudal government headed by a shogun) and Jitoshiki (manager and lord of manor) of Mizuma County, Chikugo Province, in recognition of his services in the Genpei War, was adopted by his wife's family, which was the Tachibana clan.
源平合戦の功で幕府の西国御家人となり筑後国三潴郡の地頭職となった嵯峨源氏の源久直が橘氏の娘婿となった。