10th century in Wales

This article is about the particular significance of the century 901–1000 to Wales and its people.

Events
905 920 928 969 985 986 987 992 999
 * The kingdom of Dyfed passes to Hywel Dda as a result of his marriage to Elen, the daughter of Llywarch ap Hyfaidd, following the death of Llywarch's heir, Rhydderch.
 * Hywel Dda unites the kingdoms of Dyfed and Seisyllwg to create Deheubarth.
 * King Æthelstan of England receives the submission of Welsh kings, including Hywel Dda, and sets the border of Wales at the River Wye.
 * Iago ab Idwal imprisons his brother Ieuaf ap Idwal.
 * Cadwallon ab Ieuaf becomes King of Gwynedd.
 * Maredudd ab Owain becomes King of Gwynedd, after disposing of its previous ruler, Cadwallon ab Ieuaf.
 * Maredudd ab Owain becomes King of Deheubarth.
 * Maredudd ab Owain attacks Morgannwg.
 * Cynan ap Hywel becomes King of Gwynedd.
 * Vikings sack St David's and murder the bishop, Morgeneu.

Births

 * date unknown - Llywelyn ap Seisyll, King of Gwynedd and Deheubarth (d. 1023)

Deaths
900 909 916 942 950 953 979 985 986 987 999
 * Merfyn ap Rhodri, prince of Gwynedd
 * Cadell ap Rhodri, King of Seisyllwg
 * Anarawd ap Rhodri, King of Gwynedd
 * Idwal Foel, King of Gwynedd
 * Hywel Dda, King of most of Wales
 * Haearnddur, son of Merfyn ap Rhodri (probable)
 * Iago ab Idwal, King of Gwynedd
 * Hywel ab Ieuaf, King of Gwynedd
 * Cadwallon ab Ieuaf, King of Gwynedd
 * Owain ap Hywel, King of Deheubarth
 * Maredudd ab Owain, King of Gwynedd and Deheubarth
 * Morgeneu, Bishop of St David's (in Viking raid)