Kingdom of Glywysing Teyrnas Glywysing (Old Welsh) | |||||||||||
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| 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 | ||||||||||
| 1055–1063 | |||||||||||
• Union in Morgannwg | 1063–1074 | ||||||||||
• Becomes Morgannwg (under Caradog ap Gruffydd) | 1075 | ||||||||||
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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.