An early narrative account of King Arthur's life is found in Historia Regum Britanniae ("History of the Kings of Britain") by Geoffrey of Monmouth completed around 1138.
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The fullest account of Bledric's life comes from Geoffrey of Monmouth's pseudohistorical Historia Regum Britanniae where he is numbered amongst the legendary Dukes of Cornwall.
It is largely based on the Anglo-Norman Roman de Brut by Wace, which is in turn inspired by Geoffrey of Monmouth's Historia Regum Britanniae, though is longer than both and includes an enlarged section on the life and exploits of King Arthur.
Ywain was one of the earliest characters associated with King Arthur, being mentioned in Geoffrey of Monmouth's Historia Regum Britanniae.
He translated into French, the Chronica ducum Lotharingiae and Brabantiae Edmond de Dynter, the Historia regum Britanniae of Geoffrey of Monmouth and the Annals historiae illustrium principum Hannoniae of Jacques de Guyse.
The Historia Regum Britanniae says that at the time of her death Samuel was judge in Judea, Aeneas Silvius was ruling Alba Longa, and Homer was gaining fame in Greece.