John Blackthorne is a fictional character from the novel "Shōgun," written by James Clavell. He is an English navigator who becomes shipwrecked in Japan during the early 17th century. Blackthorne's experiences in Japan expose him to the country's culture, politics, and samurai traditions, leading to significant personal growth and transformation. As the story unfolds, Blackthorne becomes involved in the power struggles of the Japanese feudal system, particularly with the warlord Toranaga. His interactions with various characters highlight the clash between Western and Eastern values, making him a pivotal figure in the narrative and a representation of cultural exchange.