Maelgwn ab Owain Gwynedd
Little is known about him , but he was the son of Owain Gwynedd and Gwladus ferch Llywarch ap Trahaearn , and therefore full brother to Iorwerth Drwyndwn , the father of Llywelyn the Great . 
<triplet> Owain Gwynedd <subj> Iorwerth Drwyndwn <obj> child <triplet> Iorwerth Drwyndwn <subj> Owain Gwynedd <obj> father <subj> Llywelyn the Great <obj> child <triplet> Llywelyn the Great <subj> Iorwerth Drwyndwn <obj> father