In around 1465, he acquired a calligraphy work by Bonki SOSEKI on which the characters of Sesshu were written, and requested Shinkei RYUKO to write a certificate about the origin of the name, Sesshu.
1465年（寛正6年）ごろ、楚石梵&29734（そせきぼんき）による雪舟二大字を入手し、龍崗真圭に字説を請。