Ōhara Sanemori

Ōhara Sanemori was a swordsmith active in the late Heian period in the Ōhara district of Hōki Province (present-day Nanbu Town, Tottori Prefecture), recognized as the son or direct successor of Hōki Yasutsuna, the legendary founder of the Ko-Hōki school. As the immediate heir to Yasutsuna's technical and aesthetic legacy, Sanemori occupies a foundational position in early Japanese sword history, deeply engaged in the formation of technical and aesthetic standards at the crucial moment when the definitive curved tachi form was being established and standardized.

Sanemori's swordwork is characterized by the distinctive Ko-Hōki aesthetic: bold, flowing ō-itame or nagare-itame jigane with thick nie conferring the characteristic "Hōki-hada" quality—an archaic iron tone derived from ancient sand-iron production in the region that imparts an elegant, antique character absent from all later works. The hamon typically features suguha combined with ko-midare and ko-chōji in a restrained yet dignified rendering, with vigorous and bold nie at the edge and kinsuji or sunagashi working throughout the interior. The overall impression embodies the sublime and archaic beauty of the late Heian period—a coexistence of grandeur and serenity that represents the simple yet noble aesthetic before the subsequent flourishing of the Bizen and Yamashiro traditions and the pre-classical sword age.

The Ko-Hōki lineage, founded by Hōki Yasutsuna, continued through Sanemori, Aritsuna, and Sadatsuna, forming the genealogy of the ancient Ko-Hōki school. This lineage played the most crucial role in the transition from Nara-period sword production to the completion of the curved Japanese tachi form in the late Heian period, with Sanemori serving as Yasutsuna's direct successor in both the transmission and development of this technical tradition.

Signatures reading "Sanemori" or "Ōhara Sanemori" are confirmed; however, most swords from the Heian period are unsigned or bear unclear attributions, making authenticated works bearing Sanemori's signature exceptionally rare. Consequently, blades signed by Sanemori rank among the earliest dated examples closest to the origins of the Japanese sword, possessing extraordinary cultural and historical value. Today, Sanemori's works designated as Important Cultural Properties are held in the Tokyo National Museum, Kyoto National Museum, and other institutions.