The murder of the Constable of France, Oliver de Clisson, followed soon after, and quite completed the break down of poor Charles's mind. This powerful officer of the crown had long been feared and hated by the great feudal lords especially by the Duke of Brittany, who entertained an absurd jealousy of the one-eyed hero. Although Clisson, by his decisive victory at Auray, had secured to him the contested dukedom of Brittany, the jealous duke treacherously arrested his benefactor and guest, whom he kept prisoner in the dungeons of his castle of La Motte. In the first transports of his fury the duke had given orders that de Clisson should be put to death; but his servants, fearing the consequences of so audacious an act, left his commands unexecuted. Eventually, the Constable was permitted by his captor to purchase his freedom, a condition which was no sooner complied with, than the duke repented having allowed his foe to escape from his hands. He now suborned Pierre de Craon, a personal enemy of de Clisson, to be the executioner of his vengeance. The Constable was returning to his hotel, having spent a festive evening with his sovereign, when he was set on by his assassins. He fell, covered with wounds, and was left for dead. To increase his torments, the murderer announced to him, as he fell, his name and motives. But, though severely injured, Clisson was yet alive. The noise of the conflict reached the king, who was just retiring to rest. He hastened to the spot. His bleeding minister clung to his robe, and implored him to swear that he should be avenged. "My fidelity to your majesty has raised up for me powerful enemies: this is my only crime. Whether I recover or perish from my wounds, swear to me that I shall not be unavenged." "I shall never rest, so help me God," replied the excited monarch, "until the authors of this audacious crime shall be brought to justice." Charles kept his word. Although suffering from fever, the result of this night's alarm and exposure, he collected a considerable army, and marched for Brittany. His impatient eagerness knew no bounds. Through the sultry, noonday heat, over the arid plains and dense forests of Brittany, he pursued the assassin of his Constable. He rode the foremost of his host; often silently and alone. One day, having undergone great personal fatigue, he had closed his eyes, still riding forward, when he was aroused by the violent curveting of his steed, whose bridle had been seized by a wild-looking man, singularly clad. "Turn back, turn back, noble king," cried he; "to proceed further is certain death, you are betrayed!" Having uttered these words, the stranger disappeared in the recesses of the forest before any one could advance to arrest him.