his benefactor, unveils the whole design to Lanfranc, who immediately took measures for securing the chief conspirators. He dispatched messengers to inform the king of his danger, who returned without delay at the head of his forces, and by his presence, and his usual bold activity, dispersed at once the vapors of this conspiracy. The heads were punished. The rest, left under the shade of a dubious mercy, were awed into obedience. His glory was, however, sullied by his putting to death Waltheof, who had discovered the conspiracy; but he thought the desire the rebels had shown of engaging him in their designs demonstrated sufficiently that Waltheof still retained a dangerous power. For as the years, so the suspicions, of this politic prince increased,--at whose time of life generosity begins to appear no more than a splendid weakness. [Sidenote: A.D. 1079] These troubles were hardly appeased, when others began to break forth in his own family, which neither his glory, nor the terror which held a great nation in chains, could preserve in obedience to him. To remove in some measure the jealousy of the court of France with regard to his invasion of England, he had promised upon his acquisition of that kingdom to invest his eldest son, Robert, with the Duchy of Normandy. But as his new acquisition did not seem so secure as it was great and magnificent, he was far from any thoughts of resigning his hereditary dominions, which he justly considered as a great instrument in maintaining his conquests, and a necessary retreat, if he should be deprived of them by the fortune of war. So long as the state of his affairs in England appeared unsettled, Robert acquiesced in the reasonableness of this conduct; but when he saw his father established on his throne, and found himself growing old in an inglorious subjection, he began first to murmur at the injustice of the king, soon after to cabal with the Norman barons and at the court of France, and at last openly rose in rebellion, and compelled the vassals of the Duchy to do him homage. The king was not inclined to give up to force what he had refused to reason. Unbroken with age, unwearied with so many expeditions, he passed again into Normandy, and pressed his son with the vigor of a young warrior.