Overview
Tachi Mei Sanetsune is a tachi (single-edged long sword worn edge-downward) crafted by Sanetsune, a master swordsmith who worked in Kōbizen (eastern modern Okayama Prefecture) during the mid-to-late Heian Period. Sanetsune was one of the leading smiths of the Kōbizen school, and his work combines the graceful appearance and powerful presence characteristic of Heian blades. This specific sword is historically significant because it was dedicated to Kunōzan Tōshō-gū Shrine by Tokugawa Hidetada, the second Shogun, as a treasured heirloom from Tokugawa Ieyasu. Due to its extremely high value in Japanese swordsmith history, it has been designated a National Treasure.
Historical Background
The late Heian Period marked a crucial transition for Japanese blades, shifting from the earlier nitchō (straight-blade sword) to the curved tachi, completing the form of the Japanese sword. Bizen Province (modern Okayama Prefecture) flourished as Japan’s largest swordsmith center, blessed with high-quality magnetite iron ore, water, and fuel. Sanetsune was one of the earliest smiths of the Kōbizen school, considered a master alongside his contemporary, Tomonari. This tachi served as an “item kept close at hand” (otemotohin) for Tokugawa Ieyasu when he established the Edo Shogunate. After Ieyasu’s death, it was dedicated to Kunōzan Tōshō-gū Shrine by Tokugawa Hidetada in 1617 (Genna 3). Since then, it has been carefully preserved as a treasured blade symbolizing the sacred site of the shogunate.
Features and Appeal
This tachi is considered a masterpiece that clearly displays the characteristics of the Kōbizen school, possessing several remarkable artistic and technical features:
- Impressive Form: Despite being a grand tachi with a blade length reaching 89.4 cm, it maintains the elegant form unique to the Heian Period, featuring a deep curve (koshi-sori) of 3.8 cm.
- Beauty of the Blade Surface (Jitetsu): The blade exhibits beautiful surface harmony, characterized by koitame (a very fine and intricate grain pattern) combined with subtle jinie (microscopic crystallization).
- Blade Pattern (Ha-mon) Expression: The hamon (temper line) is primarily composed of koranare (small irregular patterns), mixed with the characteristic Kōbizen chōji (clover/square pattern) and ashi (dots). This combination presents a rich variety of expressions within the quiet, dignified aesthetic typical of Heian swords.
- Inscription: The tang (kubi) clearly bears the two-character inscription “Sanetsune,” making it an invaluable document for identifying its creator.
- Historical Significance: As an heirloom of Tokugawa Ieyasu and a dedication from Hidetada, this sword holds the most important position among the treasures of Kunōzan Tōshō-gū Shrine, conveying the historical significance of both the warrior class spirit and deep faith.
Source: Excerpted from the National Designated Cultural Properties Database (https://kunishitei.bunka.go.jp/bsys/index)