John Blackthorne, also known as Anjin-san, is the protagonist of James Clavell's 1975 novel Shōgun. The character is loosely based on the life of the 17th-century English navigator William Adams, who was the first Englishman to visit Japan. The character appears in the 1980 TV miniseries Shōgun, played by Richard Chamberlain,[1] and by Cosmo Jarvis in a 2024 series based on the book.

William Adams (Japanese: ウィリアム・アダムス, kyūjitai: ウヰリアム・アダムス, Hepburn: Uwiriamu Adamusu) (24 September 1564 – 16 May 1620), better known in Japan as Miura Anjin (Japanese: 三浦按針, "the pilot of Miura"), was an English navigator who, in 1600, was the first Englishman to reach Japan.