Chikamitsu was a minor warlord of northern Shinano. He allied with his neighbors against Takeda Shingen. Suffering defeat, he and his compatriots went to Uesugi Kenshin around 1553 and requested his assistance. He went on to serve Kenshin in various campaigns. He later acted as a guardian to Sanada Yukimura when the latter was sent as a hostage to the Uesugi by Sanada Masayuki in 1585.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005