Idnerth Ap Meurig 
Idnerth Ap's father was Meurig Ap Tewdrig and his mother was Onbrawst Verch Gwrgan Fawr. His paternal grandparents were Tewdrig Ap Llywarch and Enynny Verch Cynfarch; his maternal grandfather was Gwrgan Fawr (Gwrcantus Magnus) Ap Cynfyn. He had two brothers named Athrwys Ap and Ffriog Ap.
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