Bitchū-denKotō (Old Swords)Jōsaku

青江次直

Aoe Tsugunao

Period

Mid-Kamakura

School

Aoe school

Active Years

13世紀中期

Tradition

Bitchū-den

Rank

Jōsaku

Description

## Aoe Tsugunao and the Bitchū Aoe School Aoe Tsugunao was a swordsmith active in mid-Kamakura Bitchū province (present-day Kurashiki area, Okayama Prefecture), and stands as one of the representative masters of the Aoe school. The Aoe school arose in the Aoe village area from the late Heian period and reached its peak in the Kamakura era, developing an aesthetic entirely distinct from neighboring Bizen despite geographic proximity. ## The Mystery of Aoe-Hada and Tsugunao's Technique Tsugunao's most striking feature is the "Aoe-hada" — the distinctive jigane that defines the entire school. The steel displays large flowing patterns (ō-hada) with streaks of clear steel (sumi-hada), covered uniformly with fine ji-nie. The result is a bluish, translucent clarity unlike any other regional tradition — a phenomenon produced by trace elements in Bitchū iron sand combined with the school's unique forging and quenching methods. His hamon centers on suguha and ko-midare, with the school's signature "gyaku-chōji" (reverse clove) — projections pointing downward toward the tang rather than up toward the edge, as in normal chōji. This inversion creates a sense of gravity and stability, offering a visual experience opposite to the upward energy of Bizen chōji. ## Tsugunao Among His Contemporaries The mid-Kamakura Aoe school included outstanding smiths like Tsunetsugu, Sadatsugu, Tsugiie, and Masatsugu alongside Tsugunao — all working within the shared aesthetic of Aoe-hada and gyaku-chōji while expressing individual variations. Tsugunao's works maintain the school's high standards in both jigane quality and hamon execution, making them reliable references for Bitchū Aoe attribution. ## Surviving Works and DATEKATANA Tsugunao's surviving works include Important Cultural Properties, confirming his lasting significance. DATEKATANA recognizes that the Aoe school's "quiet beauty of clear skin and reverse clove" represents a third aesthetic pillar — distinct from Bizen's flamboyance and Sōshū's power. Aoe Tsugunao's blades invite those willing to engage quietly with them into the deeper layers of the Japanese sword's artistic world.