Kantei
A long, deeply curved blade, whole, with the nakago at the bottom, on a black background.

Bizen · Fukuoka Ichimonji · mid-Kamakura

Ichimonji Norifusa (一文字則房)

A master of the Fukuoka Ichimonji school of Bizen, in the mid-Kamakura period, with two National Treasures: his times, his style, his works and his sources

Norifusa (則房, Norifusa) is one of the great names of the 福岡一文字 (Fukuoka Ichimonji) school of Bizen, in the mid-Kamakura period. Two works bearing his name are National Treasures; his temper, which slants backwards, sets him apart within the school; and tradition has him living in Katayama and heading the 片山一文字 (Katayama Ichimonji) branch.

Committee for the Protection of Cultural Properties, “Kokuhō zuroku” (1957), on Wikimedia Commons

2
National Treasures (kokuhō) bearing his name
1
Important Art Object (jūyō bijutsuhin) exhibited in 2026
77.3 cm
Length of the Fukuyama tachi
Kamakura, 13th century
Period
On this page
  1. Quick profile
  2. In short

Quick profile

Name
Norifusa; he is called Ichimonji Norifusa and Katayama Ichimonji Norifusa HD
Kanji and reading
一文字則房 (Ichimonji Norifusa) · the signature, 則房 (Norifusa) HD
Period
Mid-Kamakura period (13th century); no dates of birth or death HD
Province
Bizen HD
School
Fukuoka Ichimonji; according to tradition, head of the Katayama Ichimonji branch AT
Master
Not recorded in the sources consulted PC
Documented fact and tradition
Documented: his signature and two National Treasures. Tradition: that he lived in Katayama. AT

In short

What we know. Two blades bearing his name are National Treasures: a signed tachi, in the Fukuyama Museum of Art, and an unsigned katana attributed to him, in the Kyūshū National Museum. The tachi comes from the Tokugawa house. A third, a katana with a folded signature, is an Important Art Object and was exhibited by the NBTHK in 2026. The habaki of the Kyūshū katana, with the three-leaf aoi of the Tokugawa, points to the same provenance.

How we know it. From the official records of the two works, on Bunka Isan Online and ColBase, and from the NBTHK catalogue. The Katayama story and his place in the school are told by the Japanese Wikipedia and by Markus Sesko.

What we do not know. His dates, his master and where Katayama was: next to Fukuoka or in Bitchū; opinions differ.

Sections

  1. Fukuoka · Katayama · mid-Kamakura Life and times The school, the Katayama tradition and what is not known about him.
  2. Chōji · sakagakaru · utsuri Work and style Sugata, jihada, hamon, bōshi, nakago and signature: the kantei keys.
  3. Two National Treasures · one Important Art Object Famous works His two National Treasures and one Important Art Object.
  4. Bibliography and credits Sources The sources consulted on 4 October 2026 and the credit for each image.