Gwenllian ferch Gruffydd

Gwenllian ferch Gruffudd was a 12th-century Welsh noblewoman. The daughter of Gruffudd ap Cynan, who reestablished the rule of Second Dynasty of Gwynedd over the Kingdom of Gwynedd, she would eventually be married to Gruffudd ap Rhys of the Dynasty of Deheubarth, the ruler of what remained of that southern kingdom. Gwenllian was the mother of all the children of Gruffudd ap Rhys, including Rhys ap Gruffudd. She is remembered for leading a battle against the Normans near Kidwelly in 1136.