Gwrgan Fawr (meaning Gwrgan the Great; also in Latin Gurgantius; English Fergus) (died c. 645) was a king of Ergyng a south-east Welsh kingdom of the early medieval period. He was the son of Cynfyn and rightful heir to the Ergyng throne which however was initially usurped by Gwrfoddw around AD 619. Gwrgan probably fled Ergyng when his inheritance was seized by Gwrfoddw Hen.
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