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Madog ap Maredudd (Middle Welsh: Madawg mab Maredud, Madawc mab Maredut; died 1160) was the last prince of the entire Kingdom of Powys, Wales. He held for a time, the FitzAlan Lordship of Oswestry, family of the Earls of Arundel, of Arundel Castle. His daughter married Lord Rhys, prince of Wales.