Japanese Tachi Forging Tradition

Timeline

1. c. 900–1100Heian-kyō · Kyoto PrefectureThe development of cavalry tactics in the late Heian period drove the establishment of the tachi form with lengthened blades and increased curvature; swordsmiths began systematically employing folded forging, steel-cladding, and tempering techniques, and the tachi gradually spread as a symbol of warrior status.
2. c. 1185–1333Kamakura and provincial swordsmith centers · JapanDuring the Kamakura shogunate, warrior demand surged, and swordsmith schools in Bizen Province, Yamashiro Province, and elsewhere flourished; the tachi developed highly codified aesthetic and technical standards in forging, quenching, hamon expression, and fittings (tachi-koshirae).
3. c. 1336–1573Muromachi · JapanIn the Muromachi period, the tachi's status rose as a celebrated art object and symbol of power, with masterworks (such as those of the Sadamitsu and Yukimitsu lines) highly prized; meanwhile, changes in battlefield conditions led to adjustments in blade length and curvature, paving the way for the katana's dominance in the Edo period.