Gwrgan probably fled Ergyng when his inheritance was seized by Gwrfoddw Hen .
He was the son of Cynfyn and rightful heir to the Ergyng throne which , however , was initially usurped by Gwrfoddw around AD 619 .
son probably fled Ergyng when son 's inheritance was seized Gwrfoddw   Hen .
He was the son of Cynfyn and rightful heir to the Ergyng throne which , however , was initially usurped by Gwrfoddw around AD 619 .