Isa Tamemune

Isa Tamemune was an early Kamakura-period warrior of Hitachi Province and the eldest son of Date Tomomune. In 1189 he joined Minamoto no Yoritomo's Ōshū campaign; at the battle of Ishinazaka he stormed the enemy stronghold and took the head of Satō Motoharu with seventeen others.

The feat won his family the district of Date, where his kinsmen founded the Date clan while Tamemune kept the ancestral Isa estate. In 1221 he was killed fighting for the shogunate at the Uji River in the Jōkyū War.