Tsuruhisa was at first a minor Shinano warlord who held a domain in the area of the Zenkôji in northern Shinano. Initially aligned with Uesugi Kenshin of Echigo province, he sided with Takeda Shingen in 1555 and was attacked by Kenshin as a result. He was later moved from Zenkôji to Kofu in Kai province, but in 1570 was restablished in Shinano. Nine years later he was assigned to Takatenjin castle in Tôtômi and was killed when the castle fell to Tokugawa Ieyasu in 1581.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005