Bizen-denKotō (Old Swords)Ryōwazamono

長船康光

Osafune Yasumitsu

Period

Late Muromachi

School

Osafune school

Active Years

15世紀後半〜16世紀前半

Tradition

Bizen-den

Rank

Ryōwazamono

Description

## The Pride of Sue-Bizen — Osafune Yasumitsu's Era Osafune Yasumitsu was a swordsmith active in Bizen Province's Osafune (present-day Setouchi City, Okayama) during the late Muromachi period (late 15th to early 16th century). He is known as a master of "Sue-Bizen" — the collective term for the Bizen swordsmiths of the very end of the old-sword period — who exemplifies the era after the Ōnin War. Sue-Bizen refers to the late kotō Bizen smiths as a whole, a designation for the period when they produced swords in large quantities and high quality to meet the expanding demand of the Sengoku (Warring States) period. After the Ōnin-Bunmei War (1467–77), Japan entered the Sengoku period of warring factions, and the demand for swords from various daimyo and warriors increased dramatically. Bizen Osafune still functioned as Japan's largest sword-producing center, and Sue-Bizen smiths including Yasumitsu engaged in vigorous swordmaking to meet this demand. As a leading Sue-Bizen smith, Yasumitsu responded to the era's requirements while preserving the traditional beauty of Bizen-den. ## The Sue-Bizen Style and Yasumitsu's Work Sue-Bizen swordmaking tends toward a transition from the complex hamon of the earlier kotō period — such as elegant chōji-midare and ōfusa-chōji — to relatively orderly gunome-midare and suguha-style hamon. This reflects the demands of mass production and practical battlefield utility, but even within this trend, Yasumitsu's finest works display the beauty of Bizen-den at a high level of completion. The characteristics of Yasumitsu's swordmaking lie in the quality of the jigane and the stable beauty of the hamon. The jigane, primarily itame, is refined in forging, and some works display the utsuri distinctive to Bizen-den. The hamon is based on gunome-midare with rich ashi and yō, developing the lively blade-interior landscape characteristic of Sue-Bizen. His finest works have a dignity reminiscent of the great pieces of the earlier kotō period, explaining why he is evaluated as particularly outstanding even among Sue-Bizen smiths. Yasumitsu also left outstanding works in wakizashi and tantō, demonstrating reliable technique across the full range from large to small blades. His ability to produce the practical yet beautiful swords demanded by Sengoku-period warriors explains his background as one of the era's most in-demand smiths. ## Sue-Bizen's Mass Production and Quality Control The Sue-Bizen smiths are said to have constructed a kind of division of labor and mass production system to meet the explosive demand of the Sengoku period. Smiths of Osafune — in the Sukesane, Morimitsu, Sukesada, and Yasumitsu lineages — each transmitted techniques within their respective lines while producing large quantities of swords. In such circumstances, quality variation was inevitable, but among Yasumitsu's signed works there are many outstanding pieces that received high evaluations in later appraisals. Even among Sue-Bizen smiths, Yasumitsu is known for particularly consistent quality, and in Edo-period sword appraisal he was regarded as "especially noteworthy even among Sue-Bizen." ## Extant Works and Cultural Property Designation Yasumitsu's extant signed works are relatively numerous even among Sue-Bizen smiths, with multiple Important Cultural Properties and Important Art Objects designated. His works are transmitted in museums and galleries across the country as well as former daimyo houses, old families, and shrines and temples, testifying to how important Bizen Osafune Yasumitsu was to the warriors of the Sengoku period. ## DATEKATANA and Osafune Yasumitsu DATEKATANA presents Osafune Yasumitsu as a capable swordsmith who, during the peak era of Japanese sword demand in the Sengoku period, responded to the era's requirements while preserving the traditional beauty of Bizen-den. As a leading Sue-Bizen figure, Yasumitsu's swordmaking is evidence of how Bizen-den's vitality endured to the end of the kotō period, embodying an important relay point that passed the baton to the swordsmith culture of the Edo period and beyond. From the perspective of the continuity of swordmaking in the historical site of Bizen Osafune, Yasumitsu is an important figure in sword history who cannot be overlooked.