The true history of the city begins with Constantine the Great. It is said that he hesitated at first, like the men of Megara, between Byzantium and Chalcedon, when he came to choose a spot from which to rule the East. But when he chose aright he founded a city which has endured to this day, and which it is inconceivable should ever be deserted again. The site on which he built is about four miles long, broadening from less than a mile where it fronts the Bosphorus to four miles from where the Marble Tower now stands to the Golden Horn. Seven hills and six valleys diversify the ground. The seven hills as we see them now stretch thus from east to west. First is that irregular elevation ending at Seraglio Point, on which stand the buildings of the old Seraglio, S. Irene, S. Sophia, the great mosque of Sultan Ahmed, and the Hippodrome. Second, and north-west of it, is the hill on which stands the column of Constantine himself, now burned and broken. On the third stands the great tower by the War Office (Seraskierat), the mosques of Bayezid and Suleiman. A valley descends northwards to the Golden Horn; and across it runs the Aqueduct of Valens, and on the other side is the hill marked by the mosque of Mohammed the Conqueror. The fifth hill stretches from the fourth almost to the Golden Horn, and on it stands the mosque of Selim. The sixth hill, divided from the fifth by a valley ascending from the Golden Horn, has now the ruins of the palace called by the people "the House of Belisarius," and the seventh extends from the south of the Adrianople Gate to the Sea of Marmora. As the old foundation, so the new planning of Constantine has its legend. It is said that he traced the boundary of his city himself, walking spear in hand and marking the line of the walls; and when his courtiers asked him how far he could go he answered, as though he saw a sacred vision, "Until He tarries Who now goes before." He ascribed in his laws the founding to the command of God.
He did not cover the whole ground of the Seven Hills. It is difficult to trace with certainty the line of the walls, but it would seem probable that they extended from what is now the inner bridge across the Golden Horn to a point on the Sea of Marmora about midway between the gate of Daoud Pasha and the Psamatia Gate. This would exclude part of the fifth, sixth, and seventh hills; but it is improbable that they were left entirely unprotected or completely excluded from the city of Constantine. By the sixth at any rate already stood the Blachernae, later to be the famous palace of the Byzantine emperors. Sycae, across the Golden Horn, was the name of what is now Galata. It was at one time the quarter where the Galatian mercenaries dwelt, and quite early in history it had another division named Pera, or "across the water." The seaward walls remained as they had been in old Byzantium, and they were repaired, and brought forward to the point whence the new land walls started. Of the remains of Constantine's time there are none that are not half destroyed or wholly altered, but the Church of S. Irene still recalls the days of its first founder, and the serpent column from Delphi still stands in the Hippodrome where he placed it.
The divisions of Constantine's city are not easy to recover. For municipal government it had, like Rome, fourteen regions, two of which were outside the walls, those (xiii.) of Sycae and (xiv.) of Blachernae. From the Golden gate, which was not far from the Marmora end of the land walls (the name Isa Kapou Mesjidi still recalls the Holy Name of Jesus which it bore), a road led to the Augusteum. The Forum of Constantine stood outside where the old Byzantine walls had been, and west of the Hippodrome. The Hippodrome extended south-west from the Forum of the Augusteum. North-east at some distance stood the Church of S. Irene. The Augusteum which, as Mr Bury says, we may translate place impériale, had the Church of S. Sophia, begun probably by Constantius, on the north; on the east the Senate house, and some buildings of the Palace; on the south the great Palace itself, built eastwards of the Hippodrome and commanding the magnificent view over the Marmora islands to the shores of Asia and the snows of Olympus.
THE HIPPODROME AND MOSQUE OF AHMED
Of the splendour of the city of Constantine many hints of description remain. Constantinople was enriched, says one writer, by the spoils of all other cities: Rome and Athens, Sicily and Antioch, were robbed of treasures. Of all these treasures the most wonderful, almost if not quite alone, survives. For eight hundred years it had already stood in the Sanctuary of Delphi, the serpent column with its triple head, inscribed with the names of the Greek city states which had triumphed on the field of Platæa. Through all the changes of the sixteen centuries since Constantine lived the column has still remained where he set it. Its heads are now broken off, and one may be seen in the museum; but parts of the inscription on the coils might still be traced fifteen years ago when rubbings were taken. The name of the Tenians, whose trireme brought the news to the Greeks of the Persian approach, may still be seen. "For this service," says Herodotus, "the Tenians were inscribed in Delphi, on the tripod, among those who had overthrown the barbarian." Thus for nearly two thousand four hundred years this memorial has endured. Of all the wonders of the city of Constantine there is none like it.
From Constantine to Justinian the history of the city may be rapidly traversed, for no great builder came between them to rival their work. It was on May 11, 330 A.D., that the city of Constantine was dedicated and received the name of New or Second Rome. Throned in the Hippodrome, ever after to be the centre of Byzantine life, Constantine gave thanks to God for the birth of this fair city, the daughter (so wrote S. Augustine), as it were, of Rome herself. Grandeur, riches, dignity, he could give to his new city: but before he died it was plain that he could not bequeath to her a legacy of peace.
The early history of Constantinople is largely concerned with the defence of the true Christian faith, handed down from the Apostles, against the errors of Arius. The Council of Nicæa (Isnik) in 325, summoned by Constantine at a place not more than a day's journey from Constantinople, defined the being of the Second Person of the Blessed Trinity as Ὁμοούσιον , of one essence (substance), with that of the Father, but centuries passed before the false teaching was overcome. It was natural that at Constantinople, the seat of imperial government, the strife should be concentrated. Thither the Arian leaders went to denounce the great S. Athanasius of Alexandria to the Emperor. It was there that Constantine gave his order to the aged bishop Alexander that Arius should be admitted to communion. There the bishop lay in prayer before the altar in the apse of S. Irene, beseeching God to spare him the profanation. There that very day Arius met his awfully sudden death.
Under the sons of Constantine the imperial city witnessed scenes of disturbance and persecution. As soon as Constantius freed himself from the danger of civil war, he threw himself warmly into the support of Arianism, and "devoted the leisure of his winter quarters," says Gibbon, "to the amusement or toils of controversy; the sword of the magistrate, and even of the tyrant, was unsheathed to enforce the reasons of the theologian"; and he refers to the happy passages in which Ammianus Marcellinus records the results of his disastrous activity, in language which loses nothing in Gibbon's English.