| The site is also named Caer Ogyrfan or The City of Gogyrfan, the father of Guinevere in legend. |
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| As Caer Guricon it is a possible alternative for the Dark Age seat of the Kingdom of Powys. |
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| Fourteen ladies enjoyed a weekend fly fishing retreat at Caer Beris Manor Hotel, Builth Wells, at the first Casting for Recovery event in Wales. |
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| In AD 50, the Ninth was one of two legions that defeated the forces of Caratacus at Caer Caradoc. |
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| Cantre'r Gwaelod's capital was Caer Wyddno, seat of the ruler Gwyddno Garanhir. |
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| Caratacus himself was defeated in the Battle of Caer Caradoc and fled to the Roman client tribe of the Brigantes who occupied the Pennines. |
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| The site of the Roman city of Viroconium Cornoviorum is known in Old Welsh as Caer Guricon. |
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| Following the Battle of Caer Caradoc, where governor Publius Ostorius Scapula defeated Caratacus, the Ordovices were no longer a threat to Rome, probably due to heavy losses. |
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| The foundations of Caer Gybi as well as a fort at Holyhead are Roman, and the present road from Holyhead to Llanfairpwllgwyngyll was originally a Roman road. |
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| One particular group, known as the Gorsedd of Bards of Caer Abiri, focus almost entirely upon holding their rites at the prehistoric site, referring to it as Caer Abiri. |
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