- Birth: 1514
- Death: 1579
- Son: Kiso Yoshimasa
- Distinction: Shinano warlord
Yoshiyasu held Fukushima castle in the Kiso region of Shinano. He assisted a number of other Shinano warlords in their attempts to contain Takeda Shingen of Kai. When this coalition failed, Yoshiyasu continued to resist Shingen until he was forced to surrender his castle of Fukushima in 1554, at which point he became a Takeda clan vassal.
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005