In 1081 the Battle of Mynydd Carn was fought between the armies of King Gruffudd ap Cynan of Gwynedd (age 26) and Rhys ap Tewdwr King Deheubarth (age 16), and the army of Caradog ap Gruffydd Prince of Gwent and Trahaearn ap Caradog (age 46) as part of a dynastic struggle for control of the Welsh kingdoms of Gwynedd and Deheubarth. The result of the battle had a radical effect on the history of Wales.

Caradog ap Gruffydd Prince of Gwent, Meilir ap Rhiwallon (age 46) and Trahaearn ap Caradog (age 46) were killed.