Belcis, Belcys
King of Denmark in Arthur’s service.
He fought for King Arthur against the Saxons at Vambieres and in the Roman War, leading a battalion of soldiers at the battle of Soissons.
In the MS 337, Belchis is called “li rois”, which probably is an error for “li Lois” or “li Blois”. He is one of the knights who help Arthur against the Saxons before Vandeberes (Vambieres).
Sources
Vulgate Merlin | 1220-1235
Le Livre d’Artus | Early 13th century