伯耆安綱 Smith
Yasutsuna stands near the very beginning of nihonto as we can name it. Working in Hōki Province, he is one of the earliest swordsmiths whom history can identify as an individual rather than a tradition, and a pioneer of the curved tachi that would define the Japanese sword for the centuries to follow. He is usually placed in the Heian period, commonly around the tenth century, though the dating of Heian smiths is genuinely uncertain and any year offered for him should be read as approximate rather than fixed.
History and lineage
The documentary record for a smith this early is thin, and honesty requires saying so. Yasutsuna is associated with Hōki Province in the western part of Honshū, but there is no school page to place him within, because the lineages we can trace with confidence form later, in the Kamakura period and after. He is better understood as one of a small number of named makers standing at the threshold of the recorded tradition, at the point where the older straight blades were giving way to the curved tachi. Attribution for work of this antiquity carries real uncertainty: signatures are scarce, comparison material is limited, and much of what is said about the earliest smiths rests on later record rather than contemporary evidence.
His name endures above all through one blade, the Dōjigiri Yasutsuna, a National Treasure held at the Tokyo National Museum. It is reckoned the foremost of the Tenka-Goken, the Five Great Swords, and is often called the yokozuna of all Japanese swords, the grand champion of the list. The name Dōjigiri means “Shuten-dōji cutter,” and it comes from the legend that the sword was used by Minamoto no Yorimitsu to slay the demon Shuten-dōji of Mount Ōe. That story is legend, not record, and is best presented as such. What can be said on firmer ground is that the blade is ranked at the summit for its genuine antiquity, its remarkable state of preservation, and the quality of its workmanship.
Identifying characteristics
Yasutsuna’s work shows the early character of the curved tachi: a slender, strongly curved blade with the curve set low toward the hand, koshizori, in keeping with Heian and early Kamakura sugata. The hada tends to a flowing itame, at times approaching a ko-itame, with the somewhat open, vigorous skin of early work rather than the tight refinement of later Kyoto smiths. The hamon is a nie-based ko-midare or small irregular pattern, often with the activity that early western-Honshū work is known for. The overall impression is of antiquity and quiet strength rather than display. Because so few securely signed works survive, these characteristics are drawn from a small reference body, and judgements about his hand carry correspondingly wide margins.
Why this matters for collectors
For all but a handful of institutions, Yasutsuna is a name to understand rather than to acquire. His securely attributed work is vanishingly rare and largely held as National Treasure or in major collections, and the Dōjigiri itself is among the most important swords in Japan. The cautions are those that attach to any very early smith. Dating is approximate, attribution rests on limited comparison, and the famous legends, the demon of Mount Ōe foremost among them, should be enjoyed as cultural history rather than mistaken for provenance. Where his importance is real is in the genealogy of the art: he marks the moment the curved tachi enters the historical record, and the line of development that runs from work like his eventually reaches the great Kamakura schools. Anything ever offered under this name would demand the most rigorous scrutiny and NBTHK examination, and even then the honest qualifier of an early attribution should remain in view.
If you’re researching Yasutsuna or the Tenka-Goken, we welcome enquiries. The blades at this level are seen, when they are seen at all, in museums rather than on the market.
