This is certainly not Caer Cadwgan, but Caer Morris, or Caer Maurrice. The title Caer Cadwgan was erroneously given when the local university in Lampeter made an archaeological dig in 1968 and named after a nearby farm called Caer cadwgan (which ,in turn, was named after an encampment). Oddly hardly anything was found when digging Caer Morris, but a torc had been found at the encampment in the 1860's. Local historians, and even in "The History of Cardiganshire" by S R Meyrick all state the correct name.Scan in on the associated O.S. map:-
http://www.visionofbritain.org.uk/maps/series?xCenter=3078442.76623&yCenter=2900222.11849&scale=63360&viewScale=181417.4208&mapLayer=nineteenth&subLayer=first_edition&title=Ordnance%20Survey%20and%20Ordnance%20Survey%20of%20Scotland%20First%20Series&download=true
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