 Carwinley near Longtown north of Carlisle is thought to represent "Caer Wenddolau" or "Gwenddolau's Fort".Genealogies make him a descendant of Coel Hen, who is believed to have ruled much of what is now southern Scotland and the Borders following the Roman withdrawal from the island of Britain, in the area known as the Hen Ogledd.Gwenddoleu was therefore likely to have been either the heir to one of the many successor states of Coel Hen's realm or a usurper who claimed descent from Coel Hen to legitimize his family's claim to the region.