Gwgon was the son of the former king Meurig or Morydd ap Llywarch Llwyd and inherited the realm on the death of his father. His sister Angharad married King Rhodri the Great of Gwynedd. Gwgon is recorded by the annals as drowning around 871. The Chronicle of the Princes places his death in the entry for 870 and says he drowned crossing the River Llychwr in Gower while fighting Viking invaders.
- Medieval Latin: Gugan rex ceredigean mersus est. Annals of Wales (A text).
- Archaeologia Cambrensis: "Chronicle of the Princes", p. 15. Accessed 27 Feb 2013.
- Lloyd, John Edward (1912). A History of Wales from the Earliest Times to the Edwardian Conquest. Longmans, Green, and Co. p. 325. Retrieved February 5, 2012.
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