Mashiko Sadamasa

Mashiko Sadamasa was a Nanboku-chō warrior and the eleventh head of the Mashiko clan, retainers of the Utsunomiya of Shimotsuke Province. The second son of Mashiko Sadashige, he held Saimyōji Castle in Haga District. Following Utsunomiya Ujitsuna, he switched from the Southern to the Northern Court and fought Southern Court armies in Hitachi.

In 1339 a force sent by Kitabatake Chikafusa seized his castles, including Saimyōji. In 1351, during the Kannō Disturbance, he led over seven hundred horse in Ujitsuna's rout of Momonoi Naotsune's far larger army, an episode recorded in the Taiheiki.