11th century in Wales
|10th century | 12th century | Other years in Wales|
|Other events of the century|
- Aeddan ap Blegywryd succeeds Cynan ab Hywel as Prince of Gwynedd.
- 24 October - Gruffydd ap Llywelyn defeats Ralph the Timid and sacks Hereford. He is now ruler of all Wales.
- Tostig leads an army into north Wales.
- Battle of Mechain between the sons of Gruffydd ap Llywelyn and the sons of Cynfyn ap Gwerstan of Powys.
- Bleddyn ap Cynfyn enacts new laws regulating the activities of bards and musicians.
- Battle of Mynydd Carn: Gruffudd ap Cynan and Rhys ap Tewdwr defeat Trahaearn ap Caradog, Caradog ap Gruffydd and Meilir ap Rhiwallon. However, Gruffudd ap Cynan is subsequently captured and imprisoned by Hugh d'Avranches, 1st Earl of Chester, and his kingdom is granted to Robert of Rhuddlan, Hugh's cousin.
- 3 July - Robert of Rhuddlan is killed by a Welsh raiding party on the shores of the Great Orme and rule of his lands is taken over directly by his cousin Hugh of Chester.
- Welsh revolt against Anglo-Norman rule. Cadwgan ap Bleddyn of Powys defeats a Norman force at the battle of Coed Yspwys.
- William II of England attempts to suppress the revolt in north Wales with little success.
- Battle of Celli Carnant in Pembrokeshire.
- William II of England again attempts to suppress the revolt (at this time led by Cadwgan ap Bleddyn) with little success.
- Hugh d'Avranches, Earl of Chester, and Hugh of Montgomery, Earl of Shrewsbury, attempt to recover lost Anglo-Norman territory in Gwynedd. In the Battle of Anglesey Sound (June or July) in which Magnus Barefoot, King of Norway, intervenes and Hugh of Shrewsbury is killed, the Normans are forced to give up Anglesey.
- Gruffudd ap Cynan (having previously escaped from imprisonment) regains the throne of Gwynedd; and Cadwgan ap Bleddyn is able to reclaim part of Powys and Ceredigion on condition of doing homage to the new Earl of Shrewsbury, Robert of Bellême.
- probable - Robert II, Duke of Normandy (a prisoner in Cardiff Castle during the 12th century)
- date unknown - Cynan ap Hywel, Prince of Gwynedd
- probable - Elystan Glodrydd, founder of the fifth Royal Tribe of Wales
- date unknown - Aeddan ap Blegywryd, Prince of Gwynedd
- date unknown - Llywelyn ap Seisyll, King of Gwynedd and Deheubarth
- date unknown - Rhydderch ap Iestyn, ruler of Gwent, Morgannwg, Deheubarth and Powys
- date unknown - Hywel ab Edwin, Prince of Deheubarth
- date unknown - Iago ab Idwal ap Meurig, Prince of Gwynedd
- date unknown - Gruffydd ap Rhydderch (in battle)
- date unknown - Bleddyn ap Cynfyn, Prince of Gwynedd and Powys
- At the Battle of Mynydd Carn (date unknown)
- April - Rhys ap Tewdwr, king of Deheubarth (killed in battle)
- date unknown - Iestyn ap Gwrgant, last native ruler of Glamorgan
- date unknown - Rhigyfarch, author of Life of Saint David
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