The Greek empire, at this time, was confined to a limited space. The emperor Athanasius had, some years before, betrayed his weakness by his apprehension. A rude and fierce people from the shores of the Volga, and thence called Bolgarians, had crossed the Balkan mountains, and carried their inroads to the walls of the city. As a protection against their incursions, a wall was commenced at Derkon on the Euxine, and continued across the peninsula to Heraclea, on the Propontis, enclosing an area of about 140 miles in circumference, called “the Delta of Thrace,” and beyond which the feeble Byzantine power could hardly be said to extend. The Turks trampled it down, and, to cut off all communication by sea, seized upon and rebuilt the castles of the Bosphorus, and then beleaguered the city with an army of 200,000 men. Where were now the fanatics of the Cross, to uphold it in its utmost need? they were applied to, and they affected to sympathize with their brethren in the East; but not one came to support this great bulwark of that faith, which the Osmanli had every where suppressed, to establish the intolerant creed of the Koran. The sovereign pontiff had predicted the fall of the heretic Eastern church, and withheld his aid till his predictions were accomplished. The whole force, therefore, to defend the walls, a circuit of twelve miles, and oppose the countless numbers that surrounded them, was 8000 men. The invincible courage of this handful of Christians repulsed the Turks in all their fierce assaults. The fortifications on the land-side were formed of a double wall, with an interval between. In vain did the enormous artillery of Mahomet batter large breaches in the outside; there was still another, to which the defenders retired, and from which they could not be dislodged; and after fruitless attempts to penetrate this last retreat, Mahomet was about to abandon the siege in despair, when he thought of an expedient as incredible as apparently hopeless. The city had been defended on the sea-side by a series of iron chains, drawn across the mouth of the harbour, which effectually excluded the Turkish fleet. He now conceived the idea of conveying his ships by land, from the Bosphorus, across the peninsula; and this he effected. Having prepared every thing, as soon as it was dark his machinery was laid−-the ships were hauled up the valley of Dolma-Bactché and across the ridge which separated it from the harbour; and the next morning the astonished Greeks, instead of their own, beheld the Turkish fleet under their walls. A general assault was now commenced on all sides, the good and gallant Palæologus, the last and best of the Greek emperors, was killed in one of the breaches, and the Turks poured in over his body.