Maelgwn ap Rhys (died 1295, birth unknown) was a rebel and descendant of Maelgwn ap Rhys ap Gruffydd. His father was Rhys Fychan, Geneu'r Glyn's last lord. On 29 September 1294, Madog ap Llywelyn led a national revolt against King Edward's royal administration in north and west Wales. While Madog rebelled in the North, Maelgwn ap Rhys led the revolt in Ceredigion. Maelgwn attempted a siege of Llanbadarn but was unsuccessful. His campaign also involved heavy raids in Pembroke and Carmarthen, until the earl of Gloucester's men killed Maelgwn in 1295 in a fight near Carmarthen. Maelgwn had two brothers, Rhys and Gruffydd, both of whom were imprisoned in Norwich until as late as 1308.

References

• J. E. Morris, The Welsh Wars of Edward I a contribution to mediaeval military history, based on original documents, Oxford, 1901
• Bridgeman, History of the Princes of South Wales, 1876
• https://biography.wales/article/s-MAEL-APR-1295