Kantei
The base of a polished blade and its dark tang, horizontal, with two open holes and three plugged with silver.

Bizen · Fukuoka Ichimonji · early Kamakura

Ichimonji Sukemune (助宗)

A smith of the Fukuoka Ichimonji school of Bizen, Go-Toba’s rotating smith in 1208: his times, his style, his works and his sources

Sukemune (助宗, Sukemune), called 大一文字 (Ō-Ichimonji), is a smith of the 福岡一文字 (Fukuoka Ichimonji) school of Bizen in the early Kamakura period: son of Norimune according to Kotobank and rotating smith of the retired emperor Go-Toba in 1208. Few blades with his signature survive; one, Uesugi Kagekatsu’s, is an Important Cultural Property.

Tokyo National Museum, via ColBase

9th month
Rotating swordsmith of Go-Toba, in the list of 1208
1
Important Cultural Property
1
Signed tachi in the Tokyo National Museum
Kamakura, 13th century
Period
On this page
  1. Quick profile
  2. In short

Quick profile

Name
Sukemune; he is called Ichimonji Sukemune, Fukuoka Ichimonji Sukemune and Ō-Ichimonji HD
Kanji and reading
助宗 (Sukemune) · 大一文字 (Ō-Ichimonji) · the title 修理亮 (Shuri no suke) HD
Period
Early Kamakura period; no dates of birth or death HD
Province
Bizen, Fukuoka HD
School
Fukuoka Ichimonji HD
Master
His father, 則宗 (Norimune), according to Kotobank; the Japanese Wikipedia gives it with an “it is said” AT
Documented fact and tradition
Documented: his signature and his works. Tradition: that the smiths of Shimada, in Suruga, descend from him. AT

In short

What we know. He signed 助宗 (Sukemune) with two characters. One of his tachi, the one used by Uesugi Kagekatsu, is an Important Cultural Property, at the Matsugasaki shrine in Yonezawa, and another is in the Tokyo National Museum.

How we know it. From the Tokyo National Museum record on ColBase, Bunka Isan Online, Kotobank and the Japanese and English Wikipedias.

What we do not know. His dates; whether the tradition that makes him the ancestor of the Shimada smiths has any basis; and his place in the Kyōhō meibutsuchō or in the wazamono lists, where he is not recorded in the sources consulted.

Sections

  1. Norimune · Go-Toba · Shimada Life and times Son of Norimune, Go-Toba’s rotating smith and the Shimada tradition.
  2. Suguha with ko-midare · slender tachi Work and style What the Tokyo National Museum record says and what belongs to the school.
  3. Matsugasaki · Tokyo National Museum Famous works Uesugi Kagekatsu’s sword and the Tokyo tachi.
  4. Bibliography and credits Sources The sources consulted on 4 October 2026 and the credit for each image.