Education
As a mark of his completion of his teacher"s training he inherited the mune part of his name Sadamune from Masamune.
相模國住人貞宗
As a mark of his completion of his teacher"s training he inherited the mune part of his name Sadamune from Masamune.
He was a son by blood or adoption of Sōshū Masamune considered by many to be the most famous of the Sōshū masters. After leaving Gōshū province to go to what is now Kanagawa Prefecture, Sadamune became a student of Masamune, sometime around the Namboku-chō era.