 It is situated near the River Dee, under Berwyn range.About 1150, it was ruled by the "Maer Du" or "Black Mayor of Rhug" and later became part of the lands of the barons of Edeirnion (see Hughes of Gwerclas) who ruled from Gwerclas Castle.The Lordship of Rhug contained the townships of Aber Alwen in the ecclesiastical parish of Corwen, which is where the manor house of Rhug was situated.