Kantei

Chikuzen and Aki · Sa school · Nanbokuchō

Sa Sadayuki (左定行)

A swordsmith of the Sa school who, according to tradition, left Chikuzen for Aki and founded the Geishū-Sa branch there: the little that is known about him and his sources

Sa Sadayuki (左定行, Sa Sadayuki) is, according to tradition, a pupil of Samonji who left Chikuzen for the province of Aki and gave rise there to the 芸州左 (Geishū-Sa) branch. No blade identified under his name is known.

1346–1370
Era in which he is placed (正平, Shōhei)
None
Blades identified under his name
Yoki-wazamono
His cutting quality, according to one source (良業物, yoki-wazamono)
On this page
  1. Quick profile
  2. In short

Quick profile

Name
Sa Sadayuki AT
Kanji and reading
左定行 (Sa Sadayuki); also written 貞行 (Sadayuki) AT
Period
Nanbokuchō, around the Shōhei era (1346–1370). AT
Province
From the Chikuzen (筑前, Chikuzen) school, he worked, according to tradition, in Aki (安芸, Aki), today’s Hiroshima. AT
School
The Sa (左, Sa) or Samonji school; the 芸州左 (Geishū-Sa) branch, that of Aki AT
Master
左 (Sa), called 大左 (Ō-Sa), according to tradition AT
Son
左国弘 (Sa Kunihiro), according to one of the genealogies AT
Documented fact and tradition
All that is known about him is tradition, recorded in genealogies and lists. No blade of his and no designation have been seen. PC

In short

What we know. Tradition makes him a pupil of Samonji, takes him from Chikuzen to Aki, places him in the Shōhei era and makes him the father of Sa Kunihiro.

How we know it. From the Osaru website, which does not cite its sources, and from the corrected keizu of the school, the 校正 (Kōsei).

What we do not know. Any blade of his, any description of his style and whether he really appears as yoki-wazamono in the treatise.

Sections

  1. Samonji · Geishū-Sa · Shōhei Life and times The Sa school of Chikuzen, his move to Aki, his son according to one genealogy and what is said about his cutting quality.
  2. Bibliography and credits Sources The sources consulted on 4 October 2026, with their link where possible.