Japanese Sword Forging Craft

Timeline

1. c. 1185–1333Kamakura · KantōSwordsmiths in Sagami, Bizen, and elsewhere during the Kamakura period established folded hammering and differential hardening quenching techniques, producing masterworks by smiths such as Gojō and Masamune; the distinctive aesthetics and combat performance of the Japanese sword took shape in this period.
2. 1401–1410Bizen (present-day Okayama Prefecture) · BizenUnder the Muromachi shogunate in 1401–1410, smiths of the Bizen, Mino, and Sagami schools continued Kamakura techniques and adapted to combat needs, mass-producing tachi and katana for samurai and wokou forces, while forging procedures and charcoal-furnace smelting systems became standardized.
3. 1645Japan · JapanDocuments such as Miyamoto Musashi's Book of Five Rings summarized sword use and craft culture from tactical and craftsman-spirit perspectives, giving Japanese sword forging a systematic theoretical expression as the material carrier of bushidō that continues to this day.