The renewal of the sentence against Henry had caused a reaction in his favour in Northern Italy. Soon after the episode of Canossa, the Countess Matilda, having no heir, had bequeathed her entire possessions to the Roman see and become a papal vassal for the term of her own life. But most of the Tuscan cities declared for Henry and thus entirely neutralised her power. Robert Guiscard was not to be tempted back from his projects against the Eastern Empire, even if it be true that Gregory offered him the Empire of the West. Thus Henry entered Italy unhindered early in 1081, and even the news that his opponents had found a successor to Rudolf in the person of Herman of Luxemburg did not stop his march. The siege of Rome lasted for nearly three years (1081-4), but ultimately he obtained possession of all the city except the castle of St. Angelo. Henry's Pope, Clement III, was consecrated, and on Easter Day Henry, together with his wife, at length obtained the imperial crown. But meanwhile he had made a fatal move. The Eastern Emperor Alexius persuaded him to make mischief in Apulia. Henry fell into the trap. Robert Guiscard rushed back to defend his own territories, and now determined to carry out his obligations as a papal vassal. Henry was taken unawares and had to retire before the Normans, who forced their way into Rome and cruelly sacked and burnt it. Gregory was rescued, but life for him in Rome was no longer possible. The Romans had betrayed him to Henry, and now his allies had destroyed the city. He retired with the Normans to Salerno, where, a year later, he died (May, 1085), bitterly attributing his failure to his love of righteousness and hatred of iniquity. [Sidenote: His reasons for his failure.] But we cannot ratify Gregory's own judgment on the reasons for his failure. Rather the blame is to be laid upon his lack of statesmanship. His egotism and his fanaticism worked together to make him believe that the supremacy of the spiritual power which he aimed at might be attained by very secular devices. In action he showed himself a pure opportunist, approving at one time what he condemned at another. And yet he had so little of an eye for the line which separates the practicable from the ideal that at Canossa he humiliated Henry beyond all hope of reconciliation, and he died in exile because he would not listen to any compromise which might be an acknowledgment that he had exaggerated his own claims. Thus, despite the undoubted purity of his life and the ultimate loftiness of his ideals, he is to be regarded rather as a man of immense force of character than as a great ecclesiastical statesman, rather as the stirrer-up of divine discontent than as a creative mind which gives a new turn to the desires and impulses of the human race. [Sidenote: His activity in Europe.]