The pro-Saxon agenda of Vortigern eventually led to his fall and probably around the latter part of the 450's, the Britano-Romans finally united under the Banner of Ambrosius, besieging Vortigern at his fortress at Caer-Guorthigirn (Little Doward, Herefordshire) which they burned to the ground killing everyone inside.
A cave, at nearby Little Doward, known as "King Arthur's Cave" can be explored, making it unique amongst candidates for the Arthurian cave legend.