in the romance of The Round Table, is represented as the treacherous knight. He revolted from his Uncle Arthur, whose wife he seduced, was mortally wounded in the battle of Camlan, in Cornwall, and was buried in the island of Avalon.
Modred raised a revolt, and the king was slain in his attempt to
quash it. (
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894