Masamune

Masamune (正宗) was a swordsmith who worked in Kamakura, Sagami Province, from the late Kamakura period through the early period of the Northern and Southern Courts (late 13th to early 14th century), and was also known as Gorō Nyūdō Masamune. He was a representative figure of Sōshū swordsmithing who perfected the Sōshū tradition, and his exact dates of birth and death are unknown. Regarding his lineage and training, tradition holds that he studied under Shintōgo Kunimitsu, who is revered as the founder of the Sōshū tradition. However, various theories exist—including that he was the son of Fujisaburō Yukimitsu, and that he was Yukimitsu's younger brother who later became his adopted son—and none is definitively established. In any case, he is considered a figure who inherited the foundation of Kamakura smithing established by Kunimitsu and Yukimitsu, and brought it to completion as a distinct forging tradition.

His style's greatest distinguishing characteristic lay in the perfection of the nie-work that represents the true essence of the Sōshū tradition. The jigane is forged by combining hard and soft steel; thick jinie appears throughout, with yu-bashiri and jikei markings visible, and the surface displays bright, lustrous qualities. The hamon is based on notare interspersed with gunome; within the edge, kinsuji, sunagashi, and inazuma work appear dynamically. This is a magnificent and vigorous execution that emphasizes the beauty of nie and the activity within the edge, and it became the standard for the forging tradition later called the "Sōshū tradition's nie-work." Many of his tantō are examples of meticulous workmanship.

What is particularly noteworthy about Masamune's works is that pieces with certainly authentic signatures are extremely rare, and the majority of extant pieces are unsigned and have been authenticated by specialists. Authenticated signed works with dated inscriptions scarcely survive. Among the rare signed pieces, the tantō "Fudō Masamune" (Important Cultural Property, Tokugawa Art Museum), which bears carvings of a waterfall Fudō and ritual fire poker, is highly regarded in scholarship as the single signed piece with the most trustworthy signature. Among his unsigned masterpieces are many celebrated blades authenticated as Masamune by the Honami family, including the tantō "Hyūga Masamune" (National Treasure, Mitsui Memorial Museum), the katana "Kanze Masamune" (National Treasure, Tokyo National Museum), the katana "Nakatsuka Masamune" (National Treasure, owned by the Agency for Cultural Affairs, deposited at the Tokyo National Museum), the tantō "Hōchō Masamune" (National Treasure, Eisei Bunko, with additional examples in the Tokugawa Art Museum and elsewhere), and the katana "Ishida Masamune" (Important Cultural Property, Tokyo National Museum).

As for his disciples and lineage, a group of master craftsmen collectively known as the "Masamune no Jittetsu" (Ten Masamune Disciples) is recognized. Sadamune, Gō Yoshihiro, Shizu Saburō Kaneuji, Hidaremoniji, Hasebe Kunishige, and Norieshige are among their representative members, but this appellation is a neologism that arose in the late Edo period (from the 'Tōken Seisanshū', Bunkyū 2 / 1862), and since it includes smiths whose active periods do not overlap with Masamune's, the prevailing scholarly view holds that not all were his direct disciples, but rather later attributions.

In later evaluation, Masamune is ranked among the "Tenka Sansaku" (Three Great Swordsmiths) together with Awataguchi Yoshimitsu of Yamashiro and Gō Yoshihiro of Etchū. The Kyōhō Meibutsuchō records forty-one pieces attributed to Masamune, the most of any smith. In rank too, he is considered among the finest works, and is renowned as the pinnacle of the Sōshū tradition in the history of Japanese swords. During the Meiji period, the scarcity of authenticated signed works led some to propose a theory of "Masamune's erasure"; however, his historical existence is substantiated by the presence of signed pieces, including Fudō Masamune.