This article is about the particular significance of the century 900 - 999 to Wales and its people.

Events

905

• Cadell ap Rhodri gives Dyfed to his son Hywel Dda to rule.

920

• Hywel Dda unites the kingdoms of Dyfed and Seisyllwg to create Deheubarth.

969

• Iago ab Idwal imprisons his brother Ieuaf ap Idwal.

985

• Cadwallon ab Ieuaf becomes King of Gwynedd.

986

• Maredudd ab Owain becomes King of Gwynedd.

987

• Maredudd ab Owain becomes King of Deheubarth.

999

• 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

909

• Cadell ap Rhodri, King of Seisyllwg

916

• Anarawd ap Rhodri, King od Gwynedd

942

• Idwal Foel, King of Gwynedd

950

• Hywel Dda, King of most of Wales

979

• Iago ab Idwal, King of Gwynedd

985

• Hywel ab Ieuaf, King of Gwynedd

986

• Cadwallon ab Ieuaf, King of Gwynedd

987

• Owain ap Hywel, King of Deheubarth

999

• Maredudd ab Owain, King of Gwynedd and Deheubarth
• Morgeneu, Bishop of St David's (in Viking raid)