Shoan Era

The Shoan era (1299–1302) represents a pivotal period in Japanese sword history. During this time, the Bizen Osafune region in Bizen Province rapidly developed into the primary center for sword manufacturing. Military leaders commissioned large quantities of high-quality swords for themselves and as temple offerings, accelerating the development of the Bizen Osafune school and the Sōshū school. A tachi (Important Cultural Property) by Nagamitsu of the Bizen Osafune school survives, bearing the inscribed date “2nd year of Shoan, 2nd month, auspicious day,” which attests to the activity of famous swordsmiths in this era. The era served as a crucial bridge in the evolution of sword-forging techniques from the Kamakura period kotō tradition to the Nanbokuchō period.