Craig Gwrtheyrn: An Iron Age hillfort on the River Teifi

Craig Gwrtheyrn, or Caer Gwrtheyrn, is an Iron Age hillfort located in Carmarthenshire. The fort is situated about 1.2 miles (1.9 km) west of the village of Llanfihangel-ar-Arth on the south side of the River Teifi.

The site is associated with the 5th-century warlord Vortigern, who may be a mythical figure described in various historical accounts. One 9th-century story in Historia Brittonum claims Vortigern built a castle on the River Teifi while fleeing from St Germanus, only for it to be set alight by a fire brought from heaven, resulting in the deaths of Vortigern and his inhabitants.

Other versions of Vortigern's death exist, and it is unknown if the hillfort acquired its name before or after these legends. The defenses of the fort measure about 160 metres (520 ft) north to south and 125 metres (410 ft) east to west, enclosing an area of about 1.5 hectares (3.7 acres).

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons