Iowerth ("Drwyndwn") ap Owain Gwynned
Iowerth, known as "Drwyndwn", was born in 1145 in Aberffraw Castle, Caernarvonshire, Wales.  Iowerth, known as "Drwyndwn", is no longer alive.

 Margaret ferch Madog
Margaret was born about 1129 in Montgomeryshire, Wales.

 Prince Llewelyn Fawr ("the Great") ap Iowerth of Wales
Llewelyn Fawr, known as "the Great", was born in 1173 in Dolwyddelan, Nantoconwy.  He died at the age of 67 on April 11th, 1240 in Aberconwy Abbey, Arllechwedd Isaf, Caernarvonshire, Wales.