And then said Sir Launcelot: I know thee well for a good knight, but wit thou well thy life and death is in my hand, and therefore yield thee to me, and thy prisoner. The other answered no word, but struck mightily upon Sir Launcelot’s helm, that the fire sprang out of his eyes. Then Sir Launcelot doubled his strokes so thick, and smote at him so mightily, that he made him kneel upon his knees. And therewith Sir Launcelot leapt upon him, and pulled him grovelling down. Then Sir Plenorius yielded him, and his tower, and all his prisoners at his will.

Le Morte D'Arthur