Unju Korekazu

Unju Korekazu was a swordsmith who worked in Edo from the late Edo period into the early Meiji era, succeeding to the name of the seventh-generation Korekazu of the Ishidō school. Treated as an official smith to the shogunal house, he was regarded as the foremost exponent of the Bizen tradition in the Shinshintō period.

Lineage

A native of Yonezawa in Dewa Province, he was a nephew of Chōunsai Tsunatoshi, one of the leading smiths of the Shinshintō era. After moving to Edo he was adopted by the sixth-generation Ishidō Korekazu, took over the headship of the school, and styled himself the seventh Korekazu. The Ishidō school traced its origins to Musashi Daijō Korekazu of the early Edo period, the lineage that revived the Bizen tradition — which had declined after the Ōnin War — during the Shintō period, and Unju Korekazu carried that technical inheritance into the Shinshintō era.

Shrine Blades and the Aoi Crest

In 1841 the shogunate ordered him to forge sacred blades to be dedicated to Ise Grand Shrine and to Nikkō Tōshō-gū. In recognition of this honor he was permitted to cut the Tokugawa aoi (hollyhock) crest into the tang of his blades. Signatures such as "Ishidō Unju Korekazu seitan kore" are known, and surviving works date from the Kaei through the Keiō eras.

Style

He specialized in the chōji-midare hamon that was the hallmark of the Ishidō school's Bizen tradition, producing bright, flamboyant temper lines with a clear nioiguchi. Abundant ashi and yō create a richly varied succession of chōji, representing an attempt to recreate the brilliance of old Bizen work through the crisp forging of the Shinshintō period. The jigane is a tightly forged ko-itame, and the sugata shows the shallow curvature and extended kissaki typical of the era.

Reputation

He is ranked as Shinshintō jōjōsaku, and works designated Jūyō Tōken survive. His blades are registered in public cultural-heritage databases, and he is counted among the principal Edo swordsmiths of the late shogunate, alongside Suishinshi Masahide, Taikei Naotane, and Minamoto Kiyomaro, as the smith who marked the culmination of the Ishidō school's Bizen tradition.