Kōsaka

The Kōsaka were a Shinano warrior family named for Kōsaka in Saku district. In 1336 Kōsaka Shinkaku raised troops for the Southern Court at Maki Castle against the Murakami and Takanashi.

Kōsaka Mino no Suke fought the governor Ogasawara Nagamoto in 1351 and 1353. Later, Muneshige submitted to Takeda Shingen, who sent him to Hanishina in 1556. In 1561 Muneshige was executed at Kaizu Castle for suspected ties to the Uesugi.