上泉信綱

Kamiizumi Nobutsuna, founder of the Shinkage-ryū school, is the only swordsman in Japanese history honored with the title 'Sword Sage' (Kensei). Born around 1508 in Kozuke Province, he mastered the Kage-ryū under Aisu Ikōsai and then transcended it to create Shinkage-ryū — a school whose philosophy centered not on killing but on 'living swords' (katsujinken), subduing opponents without inflicting harm. He pioneered the use of a padded practice sword (fukuro shinai) as a training tool, laying the groundwork for modern kendo. His student Yagyū Munenori brought Shinkage-ryū to the Tokugawa shogunate as the official school of swordsmanship. Nobutsuna is said to have fought and won thirty-nine duels without ever suffering defeat, and his art of the sword was praised by Shogun Ashikaga Yoshiteru himself.