Other Famous SwordsTachiNational Treasure

二つ銘則宗

Futatsu-mei Norimune

Also known as: Futatsu-mei Norimune; the Twin-Signed Tachi of Ko-Bizen Norimune

Smith

Ko-Bizen Norimune

Era

Late Heian period (11th–12th century)

Type

Tachi

Designation

National Treasure

Location

Tokyo National Museum

Description

Futatsu-mei Norimune — 'Twin-Signed Norimune' — is a tachi by Ko-Bizen Norimune of the late Heian period, distinguished by the extraordinary feature that gives it its name: the smith's signature 'Norimune' appears twice on the tang. This rare anomaly has generated centuries of scholarly discussion: did Norimune himself sign it twice, was a second signature added by a later hand to preserve the inscription after surface treatment, or does one represent an attribution by a later owner? Whatever the explanation, the double signature makes this blade uniquely identifiable among Heian-period tachi. Norimune was among the greatest masters of the Ko-Bizen school — working at the same period as Kanehira, whose Ōkanehira is often called the greatest tachi in Japan — and this blade is a National Treasure housed at the Tokyo National Museum.

Legends & Stories

The double signature of Futatsu-mei Norimune has generated centuries of inconclusive debate — and that irresolution is itself part of the sword's character. Japanese aesthetics has long recognized that incompleteness and mystery are not failures of meaning but its enhancement: yūgen (the beauty of what is suggested rather than stated), ma (the significance of empty space). A blade that has been studied for a thousand years and still poses unanswerable questions about its own most basic fact — why does it carry its maker's name twice? — is a blade that continues to repay attention in perpetuity. Ko-Bizen Norimune was Kanehira's contemporary, and this tachi, a National Treasure at the Tokyo National Museum, stands alongside Ōkanehira as testimony to what the Ko-Bizen masters achieved at the beginning of the great Bizen tradition. The double name is a riddle with a blade attached.