Masashige was a son of Hatakeyama Yoshimune and fled to the Uesugi domain as a result of turmoil within Noto province. He served Uesugi Kenshin and later Kagekatsu with distinction and was active in the fighting with the forces of Oda Nobunaga in Etchû. He was married to Uesugi Kagekatsu's younger sister.
References
- Initial text from Samurai-Archives.com FWSeal & CEWest, 2005