Uchimasa was the son of Ichijô Kanesada. After the defeat of his family, Uchimasa married one of Chôsokabe Motochika's daughters but was later killed after he attempted to defy the will of his father-in-law.
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005