1. Gwenllian, daughter of Endyfed Fychan ( - ), married Llywelyn "Mawr" ap Iorwerth PRINCE OF NORTH WALES.

Llywelyn "Mawr" ap Iorwerth PRINCE OF NORTH WALES The Great, son of Iorwerth DRWYNDWN (1145-c. 1174) and Margred Ferch Madog (c. 1129- ), was born in 1173. He had the title 'Prince of North Wales'. He died in 1240.