Legendary Japanese Swordsmiths: Amakuni, Masamune and Muramasa
Three names come up whenever people talk about the katana: Amakuni, Masamune and Muramasa. One is a semi-legendary founder, one is considered the greatest smith Japan ever produced, and one is famous for a curse. Here is who they were, and where legend takes over from history.
Amakuni: the father of the curved sword
Japanese tradition credits Amakuni (天国), a smith of Yamato province said to have worked around the 8th century, with making the first curved, single-edged sword. Earlier Japanese swords were mostly straight, like the chokuto, a design that came from China and Korea. In one popular story, Amakuni watched warriors return from battle with broken straight swords and set out to make a blade that would not fail, folding and differentially hardening the steel and adding a curve.
Historians treat Amakuni as more legend than fact, and very little can be firmly attributed to him. But the story captures a real change: over the Heian period, Japanese swords moved from straight blades to the curved tachi, and later to the katana.
Masamune: the master of masters
Masamune (正宗), often called Goro Nyudo Masamune, worked in Sagami province, near Kamakura, in the late 13th and early 14th centuries. He is regarded as the greatest swordsmith of the Soshu tradition, a style known for bold, active hamon, bright crystalline structures called nie, and a strong, beautiful steel surface.
Masamune's blades were treasured by shoguns and daimyo, and several are designated National Treasures of Japan. He rarely signed his work, which has led to centuries of debate about attributions. His most famous lost sword, the Honjo Masamune, disappeared after the Second World War and has never been found.
Masamune's influence is huge: a group of his students and followers, known as the Masamune Juttetsu ("Ten Brilliant Students"), spread the Soshu style across Japan.
Muramasa: the "cursed" smith
Muramasa (村正) was a smith, or school of smiths, from Ise province who worked from around the late 15th century into the 16th century. Muramasa blades were known for being extremely sharp and practical, with a distinctive matching hamon on both sides of the blade.
Muramasa is best known for a legend. Several members of the Tokugawa family were said to have been killed or injured by Muramasa blades, and the story grew that the swords were cursed and thirsty for blood. Over time, popular plays and stories turned Muramasa into a dark, almost demonic figure, often set against the calm and noble Masamune. A famous (and certainly invented) tale even pits the two against each other: a Muramasa blade held in a stream cuts everything that floats into it, while a Masamune blade lets the leaves pass by untouched.
Today Muramasa's name lives on in films, anime and games, and genuine Muramasa blades are highly prized by collectors.
Why these legends still matter
The katana you can buy today is the result of more than a thousand years of experiments by smiths like these: folding steel to control carbon and impurities, clay tempering to create a hard edge and a tough spine, and polishing to reveal the hamon. Modern smiths in Japan and in China's Longquan workshops still use many of the same ideas, even when they work with modern steels such as T10 or 1095.
Want to see how those techniques work in practice? Read How a Longquan Sword Is Made, or browse our handmade katana, tachi and wakizashi.
