Tadaaki was a younger brother of Katô Yoshiaki. During the Sekigahara Campaign he was tasked with defending the Katô's Iyo domain and led a force that crushed a Kôno/Môri attempt to land on Iyo province.
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005