Iowerth Drwyndwn Ap Owain Mawr and Margaret, of Powys Family
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Male
Iowerth Drwyndwn Ap Owain Mawr
Birth 1125 Aberffraw Castle, Aberffraw, Anglesey, Wales, United Kingdom 
Death 1174 Pennant Melangell, , Wales, United Kingdom Burial Marriage Father Prince of Gwynedd Owain Gwynedd Ap Gruffydd Mawr | F1524 Group Sheet Mother Gwladys Ap Llywarch, of Pembroke | F1524 Group Sheet
Female
Margaret, of Powys
Birth Death Burial Father Prince of Powys Madoc Ap Maremudd | F1552 Group Sheet Mother Susanna Mawr | F1552 Group Sheet
Male
+ Prince of Wales Llywelyn Fawr Ap Iowerth
Birth 1173 Dolwyddelan, Nantconwy, Wales, United Kingdom Death 11 Apr 1240 Burial Spouse Tangwystyl Goch | F1522 Marriage Spouse Joan Plantagenet | F1975 Marriage