Sohen YAMADA (whose real family name was Nishina) was the 5th abbot of Chotoku-ji Temple, which was opened by Shuzen (Moritoshi NISHINA), who had served Shonyo, the 10th abbot of Hongan-ji Temple.
山田宗偏は、本願寺第10世証如に仕えた周善（仁科盛俊）が開いた長徳寺の第5世にあたり、本姓は仁科氏である。