- Death: 1600
- Distinction: Asai retainer
- Sons: Ishida Masazumi, Ishida Mitsunari
Masatsugu was the son of Ishida Seishin and held Ishida castle in Ômi province. He retired after the defeat of the Asai in 1573 and committed suicide when he received word of his son Mitsunari's defeat at the Battle of Sekigahara.
References
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005