Castle Caladan was the official residence of the ruling clan of planet Caladan, the House Atreides for 6 generations before, and 26 more throughout their tenure as Dukes of Caladan; until the Atreides, under the rule of Duke Leto the Just, the 20th Atreides Duke, were ordered to take over the planetary fief of Arrakis in 10191 AG. It was an impressive ancient structure, made of very old stone and wood, and was characterized by many rooms and halls, as well as vaulted ceilings with patterned wooden beams. Its Dining Hall was the scene of many lush meals presided over by the Atreides Duke.