Maelgwn ab Owain Gwynedd (died c. 1173), son of Owain Gwynedd and ruler of Anglesey
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Maelgwn ap Rhys (c. 1170 - 1230), son of Rhys ap Gruffydd and ruler of part of Deheubarth
Maelgwn Gwynedd | Maelgwn ap Rhys | Maelgwn ab Owain Gwynedd |
Iorwerth was apportioned the commotes of Arfon and Arllechwedd, with his seat at Dolwyddelan, with Maelgwn retaining Ynys Môn, and with Cynan receiving Meirionydd.
Maelgwn was the son of Rhys ap Gruffydd (The Lord Rhys) by his wife Gwenllian ferch Madog, daughter of Madog ap Maredudd prince of Powys.
Rhys Gryg formed an alliance with Gruffydd against Maelgwn, then in 1195 joined with another brother, Maredudd, in a conspiracy against their father and captured Dinefwr Castle.