Sa Yasuyoshi

Sa Yasuyoshi was a swordsmith active in Hakata, Chikuzen Province (present-day Fukuoka City) during the Nanbokuchō period, a member of the Chikuzen Sa (Samonji) school established by Ō-Sa—the school's founder, who is counted among the "Ten Great Disciples of Masamune" and who transplanted the Sōshū tradition to Kyushu. Yasuyoshi's blades exemplify the distinctive Kyushu interpretation of the Sōshū style: an itame jigane with flowing grain, thick chikei, and abundant jinie, set against the slightly darker-toned Kyushu iron which makes the bright nie glow with particular intensity; and a hamon of gunome and notare enlivened by active kinsuji and sunagashi, executed in the bold Nanbokuchō manner with generous widths and powerful ō-kissaki configurations. The Chikuzen Sa school, which produced Yasuyoshi alongside Yukihiro, Kunihiro, and Yoshisada, represents one of the most important provincial diffusions of Sōshū technique and was a cornerstone of late-medieval Kyushu swordmaking. Signatures including "Yasuyoshi," "Sa Yasuyoshi," and "Chikushū-jū Sa Yasuyoshi" appear on surviving tachi, katana, wakizashi, and tantō. Works designated Important Cultural Properties, Important Art Objects, and Important Swords are held in the Fukuoka City Museum, Token Hakubutsukan, and Tokyo National Museum.