The Sōshū Tradition and Masamune — Kamakura's 'Pinnacle of the Japanese Sword'

Origins of the Sōshū Tradition — The Hōjō Shogunate and a Three-Way Fusion

The Sōshū tradition is the school of smiths that developed at Kamakura (Sagami province), the seat of the Kamakura shogunate. In the mid-Kamakura period, as the Hōjō shogunate became the political center, master smiths were gathered to Kamakura from across the country to create a new style.

Three lineages supported the formation:

• Local: Shintōgo Kunimitsu — a smith already resident in Kamakura
• Yamashiro / Awataguchi: Kunitsuna — relocated from Kyoto
• Bizen / Ichimonji: Suketsune — relocated from Bizen

Their fusion produced Yukimitsu from Shintōgo Kunimitsu’s line, and Yukimitsu’s son (or disciple) Masamune consummated the Sōshū tradition. It is a school of its own, fusing “the refinement of Kyoto + the flourish of Bizen + the martial spirit of Kamakura.”

Character of Sōshū — Nie and Notare

In a phrase, Sōshū is “the working of nie” and “notare hamon”:

• Jigane — Itame-hada rich in chikei, yubashiri, kinsuji
• Hamon — Broad notare with intermingled gunome and pointed elements, deep nie, and kinsuji / sunagashi flowing through the yakiba
• Form — Wide, thin, grand. In the Nanbokuchō, ōdachi (great tachi) appear

Sōshū is the most powerful, masculine, warrior-like style in the kotō era. Against Yamashiro’s “refinement” and Bizen’s “flourish,” Sōshū stands for “force” and “landscape.”

Shintōgo Kunimitsu — Prelude to Sōshū

Shintōgo Kunimitsu is the founder-figure of the Sōshū tradition. Reportedly a disciple of Kunitomo of the Awataguchi school in Yamashiro, he was the smith who brought the Kyoto style to Kamakura.

Kunimitsu’s work is not yet fully Sōshū and retains the Yamashiro refinement. The jihada is fine, and the hamon is suguha to small midare. He is renowned as a master of the tantō — most of his surviving pieces are designated National Treasures or Important Cultural Properties.

Yukimitsu — Foundation of the Sōshū Tradition

Kunimitsu’s son (or disciple) Yukimitsu consolidated the foundations of the Sōshū tradition. Also a master of the tantō, and especially famous for masterworks of the yoroi-dōshi (armor-piercer).

Yukimitsu’s style is richer in nie than Kunimitsu’s, and the Sōshū identity begins to emerge — chikei and yubashiri appear, and the hamon acquires strong rhythm. His work marks the transition from “Yamashiro-influenced” to “Sōshū.”

Masamune — First of the Tenka Sansaku

Masamune is the master who consummated the Sōshū tradition, and its greatest name. Of the late Kamakura period, son (or disciple) of Yukimitsu. His exact dates are unknown but are estimated at roughly 1264-1343.

His style pushed the Sōshū character to its limit:

• Jigane — Itame-hada rich in chikei, yubashiri, and kinsuji. Known as “the landscape of Masamune.”
• Hamon — Broad notare with intermingled gunome and pointed elements, deep nie, and kinsuji / sunagashi flowing through the yakiba
• Form — Wide, thin, grand

The state of ō-suriage mumei

Most of Masamune’s surviving work is “ō-suriage mumei” — later shortened, with the signed portion of the nakago cut away. Reliable signed pieces are limited to a handful of tantō.

The reason is that his blades were prized among daimyō in the Muromachi and Edo periods and were converted from tachi to uchigatana. Converting a tachi to uchigatana requires cutting off the base of the nakago — including the mei.

Representative works

• Kanze Masamune — Handed down in the Tokugawa house, National Treasure
• Ishida Masamune — From Ishida Mitsunari to the Tokugawa, Important Cultural Property
• Hōchō Masamune — Tantō, National Treasure
• Hyūga Masamune — Tantō, National Treasure, Mitsui Memorial Museum

Masamune Jittetsu — Sōshū Spreads Across the Country

Smiths who studied under Masamune or were closely influenced by him are collectively called “Masamune Jittetsu” (“Ten Disciples of Masamune”) — a later grouping of ten:

Smith	Province	Note
Sadamune	Sōshū	Masamune’s adopted son, direct successor
Gō no Yoshihiro (Gō)	Etchū	One of the “Tenka Sansaku”
Samonji (Sa Yasuyoshi)	Chikuzen	Sōden of Kyūshū
Rai Kunitsugu	Yamashiro	“The Sōshū within Rai”
Hasebe Kunishige	Yamashiro
Osafune Kanemitsu	Bizen	“Sōden Bizen”
Osafune Nagayoshi	Bizen	“Sōden Bizen”
Kaneshige	Mino	Mino Sōden
Kaneuji	Mino	Mino Sōden
Naotsuna	Iwami

Each carried the Masamune manner back to his own province, spreading Sōshū across the country. That the Sōshū tradition had the widest reach of the Gokaden is due entirely to these disciples.

Range of Sōshū influence

• Bizen — Kanemitsu and Nagayoshi established “Sōden Bizen”
• Mino — Kaneshige and Kaneuji founded the Mino tradition
• Kyūshū — The Samonji lineage
• Yamashiro — Rai Kunitsugu and Hasebe Kunishige

Most swords from the Nanbokuchō to the early Muromachi bear some trace of Sōshū influence. This is a major reason Sōshū is called the “peak” of the Japanese sword.

Sadamune — “One Step More Refined Than Masamune”

Sadamune was Masamune’s adopted son and the legitimate successor of the Sōshū tradition. Active in the early Nanbokuchō period.

Without Masamune’s fierceness, his work carries a more composed dignity. He is described as “as if Masamune had been made one step more refined.” Tokugawa Ieyasu’s beloved “Monoyoshi Sadamune” is famous. Another completion of the Sōshū style — Masamune’s landscape recomposed with restraint and quiet.

Gō no Yoshihiro (Gō) and the “Tenka Sansaku”

Gō no Yoshihiro (Gō) of Etchū is said to have been a disciple of Masamune. His short life meant few blades, and surviving examples are extremely rare.

Gō’s work stands, with Masamune and Yoshimitsu, as one of the “Tenka Sansaku” (“Three Under Heaven”):

• Masamune — Sōshū tradition
• Yoshimitsu (Awataguchi Yoshimitsu) — Yamashiro tradition, master of tantō
• Gō no Yoshihiro — Etchū, in the Sōshū sphere of influence

“Gō and a ghost — no one has seen either,” goes the saying, so few blades survive; even those handed down are mostly ō-suriage mumei. His extraordinary reputation has nonetheless held. A smith whose very existence became a legend.

The Hon’ami Family and “Masamune Kiwame”

Because so many “Masamune” are ō-suriage mumei, authentication is essential. In the Edo period, appraisal by the Hon’ami family was systematized:

• The Hon’ami issued “Masamune kiwame” (authentication) with an origami certificate
• Presence or absence of the “Masamune kiwame + origami” remains a crucial factor in modern appraisal
• A Masamune with the Hon’ami origami may sell for hundreds of millions of yen more than an unlisted “ō-suriage mumei, den Masamune”

Can one authenticate a Masamune as a Masamune? — one of the great themes of Japanese sword connoisseurship from the Edo period to today.

The Masamune–Muramasa Legend

The famous tale of Masamune and his disciple Muramasa is not historical fact. Muramasa was a mid-Muromachi smith (Ise province) and cannot have been Masamune’s disciple. But the “cursed sword Muramasa” legend that brings misfortune to the Tokugawa, and Masamune’s image as the “legitimate masterwork,” have been played off against each other repeatedly in literature and theater.

Separating history from legend is basic to sword appreciation. Simply remembering that Masamune is late Kamakura and Muramasa is mid-Muromachi dissolves many common misunderstandings.

From This Article to the Next

We have traced the Sōshū tradition and Masamune, the pinnacle of the Japanese sword. The next article turns to the other giant of the Gokaden — the Osafune school of Bizen — the 500-year foremost sword-producing region of Japan, sustaining the balance of quantity and quality. From Ko-Bizen through Ichimonji, Mitsutada / Nagamitsu / Kagemitsu / Kanemitsu, Ōei Bizen, and sue-Bizen, we trace the whole of the Yoshii-River smithing communities.