Minamoto Kiyomaro

Yamaura Tamaki, known by his gō Kiyomaro (1813–1855), was a swordsmith from Komage District, Shinano Province (present-day Tomi City, Nagano Prefecture), and is universally regarded as the greatest genius of the Shinshintō era — widely called "the supreme swordsmith of the Bakumatsu" and consistently ranked among the finest smiths in all of Japanese sword history. He came to Edo with the support of his older brother Masao and eventually worked independently under the art name Kiyomaro, producing blades of astonishing power and brilliance that fundamentally influenced the sword culture of the late Edo period and beyond.

The defining quality of his blades is the transcendent rendering of Sōshū tradition through Shinshintō technical perfection: the jigane shows densely packed ko-itame with abundant jinie that gleams with radiant luster; the hamon — combining gunome, chōji, and notare in bold, dynamic configurations — displays vigorous, turbulent nie that has come to be called "Kiyomaro's nie" (Kiyomaro no nie), a quality of fierce, roiling nie with an inner coherence that no subsequent smith has matched. The hamon interior is crowded with vigorous sunagashi, kinsuji, ashi, and yō, creating a sense of living energy that justifies his epithet "Kiyomaro the Demon God" (Kishin Kiyomaro).

His life was tragically short — he died at 42 — and the relatively small number of authenticated works has intensified their prestige. His blades were widely treasured among the samurai, sword practitioners, and daimyo of the Bakumatsu period, and works reportedly used by Sakamoto Ryōma and kept by the Shōgun's consort Atsuehime (Tensho-in) are known. After his death, the "Kiyomaro legend" took shape, and from the Meiji era onward, he became established as the "supreme swordsmith of the modern era" among sword historians and enthusiasts. Signed blades reading "Kiyomaro," "Minamoto Kiyomaro," or "Musashi-koku-jū Kiyomaro" command extraordinary prices; many are designated Important Cultural Property or Tokubetsu-Jūyō (Special Important Sword) and are held in major collections worldwide. His legacy as the supreme swordsmith of the Edo period's final chapter remains unchallenged.