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Sasaki Kojirō

Sasaki Kojirō was a Japanese swordsman of the late Azuchi–Momoyama and early Edo periods.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Sasaki Kojirō was a Japanese swordsman of the late Azuchi–Momoyama and early Edo periods. He is best known for his legendary duel with Miyamoto Musashi in 1612, in which Kojirō was killed.

Biography

Kojirō is generally described as a Japanese swordsman active during the transition from the late Azuchi–Momoyama period to the early Edo period. Details of his early life are uncertain, and different sources give different accounts of his birthplace and birth year.

The duel with Miyamoto Musashi

Kojirō is best known for his duel with Miyamoto Musashi on 13 April 1612 at Ganryū-jima. In the most widely repeated account, Kojirō was defeated and killed, making the duel one of the most famous in Japanese history.

Historical uncertainty

Much of Kojirō's life is difficult to verify from surviving records, and some accounts mix history with legend. As a result, his biography is often presented as partly historical and partly legendary.

Legacy

Kojirō remains a prominent figure in Japanese swordsmanship narratives and in later literature, film, and popular retellings. His name is especially associated with the stylized image of a master swordsman defeated by Musashi.

Key facts

  • Sasaki Kojirō was a Japanese swordsman from the late Azuchi–Momoyama and early Edo periods.
  • He is best known for his 1612 duel with Miyamoto Musashi on Ganryū-jima, in which he was killed.
  • He is also known as Ganryū Kojirō.
  • His birth year is commonly cited as around 1585, but details are uncertain.
  • His story has become a major part of Japanese martial lore and popular culture.

Frequently asked questions

Who was Sasaki Kojirō?
He was a Japanese swordsman best known for his legendary duel with Miyamoto Musashi in 1612.
What is Sasaki Kojirō also called?
He is also known as Ganryū Kojirō.
When was Sasaki Kojirō born?
A commonly cited date is around 1585, though the historical record is uncertain.
How did Sasaki Kojirō die?
He was killed in a duel with Miyamoto Musashi on Ganryū-jima in 1612.
Why is Sasaki Kojirō famous?
He is famous mainly because of his duel with Musashi, which became one of Japan's best-known sword-fighting stories.

References

  1. Wikipediahttps://en.wikipedia.org/wiki/Sasaki_Kojir%C5%8D
    Supports: Commonly cited birth and death dates, alternate name, historical period, and association with the duel against Miyamoto Musashi.
  2. Encyclopaedia Britannicahttps://www.britannica.com/biography/Sasaki-Kojiro
    Supports: Identification of Kojirō as a Japanese swordsman and his association with Miyamoto Musashi.
  3. Samurai Tourshttps://samurai-tours.com/stories/sasaki-kojiro
    Supports: Summary of Kojirō's legendary status, uncertain birthplace, and connection to Musashi.
  4. Discovery UKhttps://www.discoveryuk.com/mysteries/who-was-sasaki-kojiro-and-what-happened-at-ganryu-island/
    Supports: General account of the duel, Ganryū-jima, and the legendary nature of Kojirō's story.