Dug Harlech (Welsh History Post Glyndwr)

The Dukedom of Harlech is a royal duchy. The king of Wales has since the time of Maredudd used the title Arglwydd Harlech as one of the crowns regnal titles. With the marriage of Pendefig Dafydd Morgannwg, youngest son of King Arthur I of Wales, he was raised to be the first Dug Harlech, similarly, his elder brother, Iestyn, was raised to the dukedom of Y Wladfa (Patagonia).

As a royal dukedom, the title does come with territory associated to it, though Dafydd bought the property, Ty Morgannwg, in Caerdydd as the family home, though later generations lived in Plas Seisyllwg, Caerdydd.