Here we have the incredible story of the first western samurai, Will Adams, in a letter he wrote in desperation to merchants trading into to the East Indies.

Sources:
Dalton, William. 1861. Will Adams, The First Englishman in Japan: A Romantic Biography. London: Cassel, Peter, and Galpin.
Pletcher, Kenneth. 2012. William Adams: English Navigator. October 5.
https://www.britannica.com/biography/....
Veith, Ilza. 1945. "Englishman or Samurai: The Story of Will Adams." The Far Eastern Quarterly 5-27.