Gwrin Cut-Beard ap Cadwaladr was the grandson of King Meirchion Meirionydd. He presumably wore a neatly trimmed beard. Geoffrey of Monmouth transfers him back in time to become one of his more legendary Kings, Gurguit Barbtruc. If his stories relate to the historical figure, then Gwrin led a successful campaign against "the Danes" (presumably Anglo-Saxon raiders). He married Princess Marchell daughter of King Brychan Brycheiniog in the early 6th century and was supposed to have been buried in Caer-Legeion-guar-Uisc (Caerleon). Gwrin was succeeded by his son, Gyddno Garanhir.