But the throne of Constantinople was shaken by a revolution: the imperial family of Ducas was confined to the palace or the cloister; and Robert deplored and resented the disgrace of his daughter and the expulsion of his ally. A Greek, who styled himself the father of Constantine, soon appeared at Salerno, and related the adventures of his fall and flight. That unfortunate friend was acknowledged by the duke, and adorned with the pomp and titles of imperial dignity; in his triumphal progress through Apulia and Calabria, Michael was saluted with the tears and acclamations of the people; and Pope Gregory VII exhorted the bishops to preach, and the Catholics to fight, in the pious work of his restoration. After two years’ incessant preparations, the land and naval forces were assembled at Otranto, and Robert was accompanied by his wife, who fought by his side, his son Bohemond, and the representative of the emperor Michael. Before the general embarkation the Norman duke despatched Bohemond with fifteen galleys to seize or threaten the Isle of Corfu. The Island of Epirus and the maritime towns were subdued by the arms or the name of Robert, who led his fleet and army from Corfu (we use the modern appellation) to the siege of Durazzo. In the prosecution of his enterprise the courage of Guiscard was assailed by every form of danger and mischance. In the most propitious season of the year, as his fleet passed along the coast, a storm of wind and snow unexpectedly arose; the Adriatic was swelled by the raging blast of the south, and a new shipwreck confirmed the old infamy of the Acroceraunian rocks. The sails, the masts, and the oars were shattered or torn away; the sea and shore were covered with the fragments of vessels, with arms and dead bodies; and the greatest part of the provisions was either lost or damaged. The Normans had wept during the tempest; they were alarmed by the hostile approach of the Venetians, who had been solicited by the prayers and promises of the Byzantine court. The Apulian and Ragusian vessels fled to the shore; several were cut from their cables, and dragged away by the conqueror; and a sally from the town carried slaughter and dismay to the tents of the Norman duke. A seasonable relief was poured into Durazzo, and as soon as the besiegers had lost the command of the sea, the islands and maritime towns withdrew from the camp the supply of tribute and provision. That camp was soon afflicted with a pestilential disease; five hundred knights perished by an inglorious death; and the list of burials (if all could obtain a decent burial) amounted to ten thousand persons. Under these calamities the mind of Guiscard alone was firm and invincible; and while he collected new forces from Apulia and Sicily, he battered or scaled or sapped the walls of Durazzo. [Sidenote: [1081-1085 A.D.]]