Duke Leto Atreides is a central character in Frank Herbert's science fiction novel series, Dune. He is the noble ruler of the desert planet Arrakis, also known as Dune, which is the only source of the valuable spice melange. Leto is known for his strong sense of honor, leadership, and commitment to his family, particularly his son, Paul Atreides. As the head of House Atreides, Duke Leto faces political intrigue and danger from rival factions, including the ruthless House Harkonnen. His efforts to establish a just rule on Arrakis and protect its inhabitants, the Fremen, highlight his character's complexity and the challenges of leadership in a treacherous universe.