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.
As xenealoxías fan del un descendente de Coel Hen, quen se cre que gobernou moito do que hoxe é o sur da Escocia e os Borders seguindo a retirada romana da illa de Britania, na zona coñecida como Hen Ogledd.