Sadamune San Tetsu in Japanese Katana terminology
貞宗三哲 Sadamune San Tetsu
What is Sadamune San Tetsu in Japanese Katana terminology?
Sadamune San Tetsu refers to the three outstanding swordsmiths who were disciples of "Sadamune", a representative disciple of "Masamune". The three are "Nobukuni of Yamashiro Province", "Motoshige", and "Houjouji Kunimitsu".