The first significant occurrences of the word Budō date back to the Kōyō Gunkan (16th century) and were used to describe the samurai lifestyle rather than the practice of martial techniques. The word was later re-theorized and redefined to the definition we know today. First by Nishikubo Hiromichi and the Dai Nippon Butokukai when the name of their vocational school for martial arts was changed from "bujutsu senmon gakkō" to "budō senmon gakkō". And later by Jigoro Kano, judo's founder, when he chose to name his art judo instead of jujutsu.