Llywelyn ap Iorwerth, Prince of North Wales 
Llywelyn, known as the Great, was born in 1173. The Great's father was Iorwerth Drwyndwn. His paternal grandfather was Owain Gwynedd. He was an only child. He died at the age of 67 in 1240.General Notes
He hanged the Anglo-Norman baron, William de la Braose, for having an affair with his wife.
Children of Llywelyn ap Iorwerth, Prince of North Wales
* Margaret ap Llywelyn
* Helen (?)+ d. a Feb 1294/95
Children of Llywelyn ap Iorwerth, Prince of North Wales and Joan (?)
* Helen ap Llywelyn+ b. c 1207, d. bt 1 Jan 1253 - 24 Oct 1253
* David, Prince of North Wales b. c 1208, d. 1246
Children of Llywelyn ap Iorwerth, Prince of North Wales and Tangwystyl Goch
* Gwladus Du (?) d. 1251
* Dafydd (?)
* Angharad (?)
* Gruffydd (?) b. b 1240
