Gwenhwyfar was the daughter of unknown parents. The date and place of her birth have not been found.
Her husband was Ieuan ap Einion. They were married, but the date and place have not been found. They had no known children.
Note 1
dau. of Einion (ap SIESSELT) YNYR VYCHAN or his father Ynyr Vychan ap YNYR (? - 1323+)