正宗十哲 Masamune Juttetsu

What is Masamune Juttetsu in Japanese Katana terminology

"Masamune Juttetsu" refers to the ten outstanding disciples of the swordsmith "Masamune". Although there are various theories, the representative ones are "Gou Yoshihiro", "Bizen Osafune Kanemitsu", "Sa Yasuyoshi", "Nagayoshi", "Raikunitsugu", "Hasebe Kunishige", "Etchu Norishige", "Shizu Saburo Kaneyoshi", "Kaneshige", and "Naozuna".