Madog ap Maredudd 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.

The Kingdom of Powys was a Welsh successor state, petty kingdom and principality that emerged during the Middle Ages following the end of Roman rule in Britain. It very roughly covered the northern two-thirds of the modern county of Powys and part of today's English West Midlands. More precisely, and based on the Romano-British tribal lands of the Ordovices in the west and the Cornovii in the east, its boundaries originally extended from the Cambrian Mountains in the west to include the modern West Midlands region of England in the east. The fertile river valleys of the Severn and Tern are found here, and this region is referred to in later Welsh literature as "the Paradise of Powys".