Duncan Idaho is a fictional character from Frank Herbert's science fiction series, Dune. He serves as a loyal swordmaster and friend to the protagonist, Paul Atreides. Known for his exceptional combat skills and bravery, Duncan plays a crucial role in the political and military struggles on the desert planet of Arrakis. Throughout the series, Duncan's character evolves, and he is often seen as a symbol of loyalty and honor. He is also notable for his multiple resurrections through the use of ghola technology, which allows him to be brought back with memories of his past lives, adding depth to his character and story.