
Le Morte d'Arthur (originally spelled Le Morte Darthur, ungrammatical Middle French for "The Death of Arthur") is a 15th-century Middle English prose reworking by Sir Thomas Malory of tales about the legendary King Arthur, Guinevere, Lancelot, Merlin and the Knights of the Round Table—along with their respective folklore. In order to tell a "complete" story of Arthur from his conception to his death, Malory compiled, rearranged, interpreted and modified material from various French and English sources. Today, this is one of the best-known works of Arthurian literature. Many authors since the 19th-century revival of the legend have used Malory as their principal source. )
For more historical diving, Oxford maintains a list of books and papers written on the matter.
Most of the Arthur "myth" is deliberately constructed fiction by specific authors, rather than folk myths.
Extremely tortuous phraseology. But I finished it, with gritted teeth at 15.
I have long since abandoned the desire to finish every book I start. Life is too short.