But even though his role in the novels has been diminished, Perceval has remained an important figure and he is one of only two knights (the other being the knight Bohors) who accompanied Galaad to the Grail Castle and conducted the search with him .

Uther is the youngest son of King Constantine II. The eldest, Constant, heir to the throne of Brittany, is killed by the usurper Vortigern. ... Became king in his turn, he adopts the name of Pendragon and makes two gold dragons, one of which serves him as a badge. He continues successfully the fight against the Saxons.

In fact, many elements that are now part of the history of King Arthur appear in the Historia Regum Britanniae: the father of Arthur Uther Pendragon, Merlin the Enchanter, the sword Excalibur, the birth of Arthur at Tintagel, his last battle against Mordred at Camlann

Merlin is surrounded by other literary characters from a Celtic mythological background or Arthurian legend. The best known are the Blaise scribe who records his story, the King Arthur whom he watches and protects, and the fairy Viviane he loves. Morgane and Viviane are his pupils.