Maredudd ap Rhys Grug, was the son of Rhys Gryg and Mathilde de Clare. Maredudd initially ruled north east of Ystrad Tywi, including Llandovery Castle, until he expanded to rule the region encompassing Dryslwyn castle.
- Occupation
- monarch, aristocrat
- Position held
- prince
- Born
- 1250
- Died
- July 27, 1271
