South of the Golden Horn, on the narrow tongue of land--narrow it seems as seen from the hills of the northern shore--is the city of Constantine and his successors in empire, seated, like the old Rome, on seven hills, and surrounded on three sides by sea, on the fourth by the still splendid, though shattered, mediæval walls. Northwards are the two towns, now linked together, of Pera and Galata, that look back only to the trading settlements of the Middle Ages. The single spot united, as Gibbon puts it, the prospects of beauty, of safety, and of wealth: and in a masterly description that great historian has collected the features which made the position, "formed by Nature for the centre and capital of a great monarchy," attractive to the first colonists, and evident to Constantine as the centre where he could best combine and command the power of the Eastern half of his mighty Empire. [Illustration: THERAPIA] "Situated in the forty-first degree of latitude, the imperial city commanded, from her seven hills, the opposite shores of Europe and Asia; the climate was healthy and temperate, the soil fertile, the harbour secure and capacious, and the approach on the side of the continent was of small extent and easy defence. The Bosphorus and Hellespont may be considered as the two gates of Constantinople, and the prince who possessed those important passages could always shut them against a naval enemy and open them to the fleets of commerce. The preservation of the eastern provinces may, in some degree, be ascribed to the policy of Constantine, as the barbarians of the Euxine, who in the preceding age had poured their armaments into the heart of the Mediterranean, soon desisted from the exercise of piracy, and despaired of forcing this insurmountable barrier. When the gates of the Hellespont and Bosphorus were shut, the capital still enjoyed, within their spacious enclosure, every production which would supply the wants, or gratify the luxury, of its numerous inhabitants. The sea-coast of Thrace and Bithynia, which languish under the weight of the Turkish oppression, still exhibits a rich prospect of vineyards, of gardens, and of plentiful harvests; and the Propontis has ever been renowned for an inexhaustible store of the most exquisite fish, that are taken in their stated seasons without skill, and almost without labour. But when the passages of the straits were thrown open for trade, they alternately admitted the natural and artificial riches of the north and south, of the Euxine, and of the Mediterranean. Whatever rude commodities were collected in the forests of Germany and Scythia, as far as the sources of the Tanais and the Borysthenes; whatsoever was manufactured by the skill of Europe or Asia; the corn of Egypt, and the gems and spices of the farthest India; were brought by the varying winds into the port of Constantinople, which for many ages attracted the commerce of the ancient world."