Iorwerth Drwyndwn, b:



		^{Owain Ap Gruffydd}^{b. Caernarvon Castle, Wales d.1170 Caernarvon Castle, Wales}

	^{Iorwerth Drwyndwn}^{b. Wales d.1174}		^{Llywarch Ap Trahaern}^{b. d.1129}

		^Gladys^{b. Montgomershire, Wales d.}

^{Llywelyn Ap Iorwerth}^{b.1173 Aberffraw Castle, Wales d.1240 Caernarvonshire, Wales}

		^{Madog Ap Maredydd}^{b. Montgomershire, Wales d.1160 Winchester, England}

	^Marared^{b. Montgomeryshire, Wales d.}		^{Gryffydd Ap Cynan}^{b. d.1137}

		^{Susanna Verch Gruffydd}^{b. Caernarvon Castle, Wales d.}