Yamana Masauji

Yamana Masauji was a warrior of the late Kamakura and Nanboku-cho periods, son of Yamana Yoshitoshi and head of a Yamana branch of the Nitta clan in Kozuke.

When Nitta Yoshisada marched against Ashikaga Takauji in 1335, Masauji refused to follow the Nitta main line and sided with the Ashikaga, his wife's kinsmen. After the Muromachi bakufu was founded in 1336 he went on serving Takauji. The family headship later passed to his son Yamana Tokiuji.