Maredudd ap Rhys Gryg

Maredudd ap Rhys Grug (died 1271), was the son of Rhys Gryg (a Welsh prince of Deheubarth) and Mathilde de Clare (a daughter of Richard de Clare, 3rd Earl of Hertford, Marcher Lord of Cardigan). Maredudd initially ruled north east of Ystrad Tywi, including Llandovery Castle, until he expanded to rule the region encompassing Dryslwyn castle.

When his father died, in 1234, Maredudd was still young, and his wardship was entrusted to Gilbert Marshal, 4th Earl of Pembroke; their mothers were distant cousins. In 1241, Maredudd married Gilbert's niece, Isobella;

In 1261, Maredudd was granted reconciliation with Llywelyn under severe terms, though the king retained Maredudd's homage in 1267 following the peace of Montgomery. Llywelyn received this homage in 1270.