Shigemochi was the second son of Mikumo Sadamochi (d.1570). He at first served Rokkaku Yoshikata, then became a ronin when the Rokkaku were defeated by Oda Nobunaga. He eventually entered the service of Oda Nobuo (1584). He later became a retainer of the Gamô family.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005