St. Gwynlliw the Bearded is a late 5th century or early 6th century Welsh king and saint of Glamorgan who traditionally founded St Woolos Cathedral. By his wife Gwladys, Gwynlliw was the father of St. Cadog. Cadog is said to have given up his kingdom to his son Cadog to live as a hermit until he died. See Vita Sancti Gundleii. Bromwich (2006, p. 296) notes that the surname Barchoc (‘Bearded’) was often confused in manuscripts with marchoc (‘knight’).