Prince Owain ("Gwynedd") ap Gruffydd of North Wales
Owain, known as "Gwynedd", was born in Caernarvonshire, Wales.  He died on November 28th, 1170 in Caernarvonshire, Wales.  He was buried in Bangor Cathedral, Is Gwyrfai, Caernarvonshire, Wales.

 Gladys verch Llywarch
Gladys was born about 1098 in Arwystli, Montgomeryshire, Wales.

 Gwenllian verch Owain I
Gwenllian was born about 1124 in Caernarvonshire, Wales.

 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.