Taira no Masatsune

Taira no Masatsune was a mid-Heian warrior of the Kanmu Taira line and founder of Musashi's Chichibu clan, born to Taira no Tadayori and Haruhime, daughter of Taira no Masakado. In 1023 he led troops against Musashi's assistant governor, who had defied an imperial order, and defeated him at Toshima.

He was rewarded with lands in several provinces. He took no part in his brother Taira no Tadatsune's 1028 revolt and kept his lands; based in Chichibu, he is said to have fallen in the Earlier Nine Years' War aged fifty-one.