A chronicle of the achievements of King Arthur and his Knights of the Round Table. Arthur is described as the natural son of Uther, pendragon (or chief) of the ancient Britons. He succeeded his father, in 516, by the aid of Merlin, who gave him a magic sword, with which he conquered the Saxons, Picts, Scots, and Irish. Besides the Brut referred to, several other romances record the exploits of this heroic king.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894