Tachi (inscribed Kunimune)

A Kamakura Sword Signed in Two Characters

Two small, angular characters cut near the base of the tang read Kunimune. They are the only words on a curved blade just over 81 centimeters long, and they identify one of the finest surviving works by a swordsmith who helped change the course of Japanese sword-making in the thirteenth century. The blade now belongs to Terukuni Shrine in Kagoshima and is kept at the prefectural museum known as the Reimeikan, the single National Treasure held within Kagoshima Prefecture.

Kunimune worked in the middle of the Kamakura period (1185–1333). He came from Bizen province, in what is now Okayama, the region that produced more celebrated swordsmiths than anywhere else in medieval Japan. As the third son of the smith Kunizane, he was commonly called Bizen Saburō Kunimune, "Saburō" marking him as a third son. He did not belong to the dominant Osafune line but to the smaller Naomune branch founded by his grandfather.

What sets his career apart is what happened next. According to tradition, the Kamakura regent Hōjō Tokiyori summoned Kunimune east to the shogunal capital at Kamakura. There, alongside the Kyoto smith Awataguchi Kunitsuna and his fellow Bizen smith Sukezane, he is credited with laying the groundwork for the Sōshū tradition, the bold style of Sagami province that would later reach its height under Masamune. Kunimune is said to have passed his methods to Shintōgo Kunimitsu, regarded as the effective founder of that tradition. One account, difficult to verify, has him living to the age of 94.

How to Read the Blade

The sword is a tachi, the long, deeply curved sword worn edge-down and slung from the belt, the form that preceded the later katana. It shows the construction expected of a mid-Kamakura masterpiece: a ridged cross-section (shinogi-zukuri), a gabled back (iori-mune), a broad body, and a strong curve concentrated toward the hilt. The point is short and stout, the so-called ikubi or "boar's neck" shape that signals the period as clearly as a date would.

Look closely and the surface comes alive. The forging shows a wood-grain pattern that stands slightly proud of the steel, with thick crystalline activity in the ground and a cloudy reflection, the utsuri, running the length of the blade. The temper line is a clove-shaped chōji pattern mixed with rounded gunome, full of variation rather than mechanical repetition. Above the cutting section, small detached islands of hardening appear on both faces, and bright lines of kinsuji streak through the harder steel in places. The tang is original and unshortened, its tip cut straight and its edges chamfered, with two peg-holes and shallow file marks.

The national database lists the blade at 81.3 centimeters with a curvature of 2.6 centimeters; a few other records give 81.4 centimeters, a difference of a single millimeter that reflects how and where the measurement is taken. The Agency for Cultural Affairs ranks this blade beside the National Treasure Kunimune held at Nikkō Tōshōgū, praising both its commanding shape and its exceptional state of preservation.

A National Treasure That Vanished and Came Back

The sword descended for centuries through the Shimazu family, the lords of Satsuma who ruled this corner of Kyushu. In June 1927, Shimazu Tadashige presented it to Terukuni Shrine to mark the 700th memorial of the clan's founding ancestor, Shimazu Tadahisa. That same year it received protection under the prewar law for ancient shrines and temples, the legal status that corresponds to today's Important Cultural Property.

Its later history reads like a thriller. In the disorder that followed the Second World War, the blade was confiscated by the occupation and disappeared. It surfaced in the United States, passed through an auction, and eventually entered the collection of the American sword enthusiast Walter A. Compton. In 1963 Compton returned it to the shrine at no charge, an act of goodwill that brought a lost masterpiece home. The following year, in 1964, it was designated a National Treasure under postwar law. After a long period on deposit at the Tokyo National Museum, it has been housed at the Reimeikan in Kagoshima since 1993.

Because of that fragile and famous history, the sword is not on permanent view. The shrine notes that it is brought out for special display roughly twice a year, so checking the museum's current schedule before a visit is the surest way to see it in person.

Around the Reimeikan

The museum sits on ground with its own connection to the sword. The Reimeikan stands on the former main bailey of Kagoshima Castle, also called Tsurumaru Castle, the residence of the Shimazu lords whose family once owned the blade. The reconstructed Goromon gate, rebuilt in 2020 after nearly a century and a half, marks the entrance, and the surrounding moat, stone walls, and stone bridges survive from the castle period. The castle ruins were designated a national historic site in 2023.

The building itself opened in 1983 and presents Kagoshima's archaeology, history, folklore, and crafts across several floors, with displays now offered in multiple languages and an audio guide. A short walk away is Terukuni Shrine, which enshrines Shimazu Nariakira, the reform-minded nineteenth-century lord, and whose broad approach and large torii gate make a natural pairing with a museum visit. The area around the castle site, with the green slope of Shiroyama rising behind it, rewards an unhurried morning on foot.