Vandalior, Vandeberes en Cornoaille, Vandelers
A castle in Cornwall.
According to Malory the rebel kings had to leave off warring with Arthur because the Saracens were besieging their castle of Wandesborow. In the Vulgate, however, the rebel kings were called away from their war with Arthur because the Sesnes, or Saxons, were attacking Vandaliors, in Cornwall (Cornuaille), in the early days of Arthur’s reign.
Vandaliors sounds as if it could be a variant of Wandesborow, which Malory might have confused the Sesnes with the Saracens in this passage. Nevertheless, one could consider Wandesborow and Vandaliors as two separate strongholds.
Source
Vulgate Merlin | 1220-1235