The stream of commerce between the East and the West which had flowed through the Bosporus had been diverted into other channels, and the great _emboloi_ and warehouses were lying empty or in ruins. Tana or the Azof, which had been the starting-point of a great caravan route through Bokhara, Samarcand, and Balkh, now no longer contributed largely to the commerce of Constantinople. Such of its trade as was not sent overland to Western Europe was held by the Venetians, and at a somewhat later period by the Genoese or other Italians, and scarcely contributed at all to the wealth of the capital. The Danube became during the thirteenth century the highway between the Black and the North Seas. The city which had been the great centre for the collection and distribution of the furs, the hides, the caviare and dried fish, the honey, wax, and other produce which the Russian merchants collected and stored for the use of the West, was now studiously avoided. The Western traders who had met those from Novgorod, Tchernigov, and Kief at Constantinople now found their way to the mouth of the Dnieper and arranged for the transit of their goods so as to avoid the pirates whom the Latin rulers of Constantinople were unable to suppress, or the exactions levied upon their merchandise if they came within the power of the ancient capital. Trade which had come to Constantinople along the ancient roads through Asia Minor had either ceased to exist or had been diverted into other channels. The confidence arising from a sense of security which through a long series of years had attracted commerce could not be restored and in fact was never regained. The loss of her trade took from Constantinople the only external source of revenue. The restored empire had thus to depend almost exclusively upon the contributions which it could levy upon the long harassed and impoverished peoples who recognised its rule. The recapture of the capital, though an epoch-marking event, was only one step towards the restoration of the empire. It never really was restored. It never recovered the commanding position which it had occupied during even the worst periods of its history since Constantine. Its existence from 1261 to its capture by the Turks in 1453 is one long struggle. [Sidenote: Difficulties of restored empire.]