Glywysing

Kingdom of Glywysing Teyrnas Glywysing (Old Welsh)
5th century–c. 1055 (intermittently in union with Gwent/in Morgannwg)
Medieval kingdoms of Wales, showing Glywysing in the south
Capital	Cardiff
Common languages	Old Welsh
Religion	Celtic Christianity
Government	Monarchy
Historical era	Middle Ages
• Formed after Roman withdrawal from Britain	Late 5th century
• Various unions with Gwent	6th century–c. 745
• Union in Morgannwg (under Morgan Hen ab Owain)	942–974
• Union as part of Wales (under Gruffydd ap Llywelyn, King of Wales)	1055–1063
• Union in Morgannwg	1063–1074
• Becomes Morgannwg (under Caradog ap Gruffydd)	1075
Preceded by Succeeded by Roman Britain Kingdom of Morgannwg Kingdom of Morgannwg

Glywysing was, from the sub-Roman period to the Early Middle Ages, a petty kingdom in south-east Wales. Its people were descended from the Iron Age tribe of the Silures, and frequently in union with Gwent, merging to form Morgannwg.