Duncan Idaho (b. 10146 AG) was a swordmaster in the service of House Atreides, and one of Duke Leto's right-hand men, with Gurney Halleck and Thufir Hawat. Duncan Idaho was said to be very handsome. He had black, curly hair, a dark complexion, and green or blue eyes. During the days of the original Duncan Idaho, and during the time of the God Emperor, he was regarded as something of a ladies' man.