Gwenwynwyn ab Owain

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Gwenwynwyn ab Owain (died c.1216) was the last major ruler of mid Wales before the completion of the English conquest. He was a grandson of Owain Gwynedd and ruled southern Powys from 1195, having taken control following the death of his father Owain Cyfeiliog.

His possession of Powys Wenwynwyn brought him into conflict with Llywelyn the Great, ruler of Gwynedd, who was keen to extend his own jurisdiction over the whole of Wales. King John favoured Gwenwynwyn until a marriage alliance was made between Llywelyn and John's illegitimate daughter. The two native princes then kept their distance until 1208. As a result of Gwenwynwyn's activities, John confiscated his lands and allowed Llywelyn to steal Ceredigion and Powys. Gwenwynwyn did not get his territory back for two years, but his resentment towards the English led him into an alliance with Llywelyn, which lasted from 1212 until 1216, when John restored some of Gwenwynwyn's property and the two princes fell out again. Llywelyn invaded Powys, and Gwenwynwyn is believed to have died or been killed that same year. He was survived by his son Gruffydd ap Gwenwynwyn whose actions in 1282 may have led directly to the death of Llywelyn the Great's grandson and the last native Prince of Wales, Llywelyn ap Gruffydd.

Preceded by Owain Cyfeiliog

Prince of Southern Powys 1195–1216

Succeeded by Llywelyn the Great