It was fifty years since the Moslems had made their first attempt to wrest from the Byzantines this great city renowned from the earliest antiquity. Its conquest had been the cherished dream of many emirs, one after another of whom had retired in disgrace from before its walls. In every campaign, its suburbs, and the lands upon which its population were mainly dependent for subsistence, had been ravaged by squadrons of Moorish horsemen. The diminution of tribute consequent upon the failure and destruction of agricultural products, the massacre and enslavement of the cultivators of the soil, the stagnation of commerce, and the emigration of wealthy citizens, had induced the court of Constantinople--which viewed every question with an eye single to pecuniary advantage--to almost withdraw its support from the last remaining bulwark against the Moslem supremacy in Sicily. The number of inhabitants had been greatly diminished within a quarter of a century. The troops who still maintained the shadow of imperial power in the island were largely recruited from the martial youth of Syracuse. The pestilence, which had so often decimated the besiegers, had not spared the defenders of the city. Thousands had perished from this cause alone. These facts being considered, and the vast extent of its walls being remembered, it is probable that at no previous period of its history was Syracuse so ill qualified to sustain a siege. The Byzantine commander, aware of his inability to defend the outer fortifications, within which stood the finest houses and the cathedral, withdrew to the inner line which traversed the isthmus separating the two basins of the harbor. So far as the number and importance of its buildings were concerned, the city was more than half taken when the Moslem army, without opposition, filed through the deserted gateways of the outer wall. Upon the narrow isthmus, measuring but little more than a hundred yards in width, the assembled forces of both armies contended furiously for the mastery. The Moorish engineers had invented catapults of improved construction and terrific power, which instead of projecting their missiles in a curve, as had hitherto been the case, hurled them directly against the walls with unheard-of velocity and accuracy of aim. Every expedient familiar to ancient warfare was adopted to drive the garrison to extremity. Mines were carried under the towers. Greek fire was thrown into every quarter of the city, to the dismay of the besieged, who found themselves continually threatened with destructive conflagrations. The Christians were compelled to the exertion of constant vigilance to repel the storming parties that mounted to the attack at all hours of the day and night. A fleet sent by the Emperor to raise the siege was dispersed by the Saracen galleys, which by this victory virtually acquired control of the Mediterranean. The double port was occupied by the enemy, the Greeks were driven