Source: Ancestry.com, "Virginia, Prominent Families, Vol. 1-4" [database online]
Volume IV
Chapter I Warner-Reade.
Gwynn.
The Gwynns are descended from the wife of Caradoc, or Caracticus, as his name was Romanized, or from some other member of the same family. Caradoc was Chief of the Silures, son of Cynobelin (Cymbeline of Shakespeare). He had a treacherous stepmother Cartismandua, Queen of the Brogantines, by whom he was basely betrayed, and surrendered to the Romans, A. D. 51.
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Source: Ancestry.com. "Cassell's Gazetteer of Great Britain and Ireland", [database online]
After being defeated by the Romans in 51AD, Caractacus withdrew to his stronghold 'Pen-y-Gader' or 'Pencaer Helen'(1250 ft N.E. Carnarvshire, 3/4 W.S.W of Llanbedr). It is one of the most "perfect" forts in Britain, as it is on a summit with a wide veiw, and the only way to approach it is on its west side which is defended by several upright stones. Unfortunately this did not keep him from harm as he was betrayed by his stepmother, Cartismandua.