Siridar-Duke Paulos XVI Atreides was the head of House Atreides in 8677 AG. He was the father of Kallistos III Atreides. He moved his entire family from Gallatin to Caladan granted to the House by Emperor Elrood VIII. Paulos sold many of his other estates, completed Castle Caladan in 8722 AG and established his Cousines on nearby planets and systems.