During the High Middle Ages tales originating from Brythonic traditions entered English folklore and developed into the Arthurian myth. These were derived from Anglo-Norman, Welsh and French sources, featuring King Arthur, Camelot, Excalibur, Merlin and the Knights of the Round Table such as Lancelot. These stories are most centrally brought together within Geoffrey of Monmouth's "Historia Regum Britanniae" ("History of the Kings of Britain"). Another early figure from British tradition, King Cole, may have been based on a real figure from Sub-Roman Britain. Many of the tales and pseudo-histories make up part of the wider Matter of Britain, a collection of shared British folklore.