皇室と御剣の系譜

The sacred sword Kusanagi-no-Tsurugi, enshrined at Atsuta Jingū in Nagoya and never shown to any living eye outside imperial ceremony, constitutes the theological bedrock of the Japanese sword's sacred identity. The Three Sacred Regalia's role as the physical legitimacy-token of the imperial throne meant that who held the Kusanagi sword determined who could claim to be the rightful emperor of Japan—a fact that made the regalia's possession an active military and political objective from the Jinshin War (672) through the Nanbokuchō dynastic split of the fourteenth century. The imperial household's tradition of sword collection and dedication established standards of quality and a theological framework simultaneously: emperors from Shōmu (eighth century) onward dedicated masterwork swords to Ise, Kasuga, Isonokami, and other great shrines, preserving them as inviolable sacred objects while simultaneously commissioning the finest smiths of each era to create new dedicatory blades. The Shōsōin collection at Tōdaiji—essentially Emperor Shōmu's sword treasury—is the most extensive and important archive of pre-Heian Japanese blade craft. Emperor Meiji, though promulgating the Haitōrei sword-prohibition edict (1876), was himself a passionate sword collector who commissioned presentation swords from master smiths including Gassan Sadaichi and Miyairi Shōhei, establishing the imperial household as the symbolic guardian of sword culture precisely in the era of its greatest social threat. Emperor Shōwa continued this tradition, highly valuing Living National Treasure smiths' works and providing the symbolic royal patronage that reinforced the postwar sword culture revival. The practice of tenran-tōken (imperial sword inspection), through which emperors formally viewed and evaluated selected blades, invested those blades with supreme cultural authority—a living connection between the ancient sacred dimension of the sword and its modern status as Japan's highest art form.