Demetrius Poliorcetes and Lysiinachus

After repelling Philip, Byzantium had to submit, some years later, to Alexander. It passed through the hands of his successors, Demetrius Poliorcetes and Lysiinachus ; but on the death of the latter, regained its independence for another hundred years, until the power of Rome invaded the region of Thrace and the Hellespont. In return for the assistance it rendered to the Romans in their wars with Macedon and Antiochus, the senate conferred on Byzantium the status of a ‘ free and confederate city and it was not till the time of the Emperor Vespasian that it lost its privileges and became an ordinary provincial town (73 A.D.).

In the struggle between Septimius Severus and Pescennius Niger for the Roman Empire, Byzantium espoused the cause of the latter; but was taken by Severus, after a three years siege, in 197 A.D., and reduced to ashes. A few years later, however, he rebuilt the city and embellished it with porticoes, magnificent public baths, and part of the Hippodrome or racecourse.

During the civil wars which followed the abdication of Diocletian, the city fortifications were restored, and afforded refuge to Licinius after his defeat by Constantine at Adrianople in 323 A.D. Constantine advanced on Byzantium, and, by means of constructing ramparts and towers as high as those of the city, finally succeeded in taking it.

The acquaintance with the advantages

The acquaintance with the advantages of its position gained in this campaign no doubt decided Constantine in fixing on Byzantium as the site of his new capital daily tours istanbul. It had probably been for some time clear to him that the Empire, once more united under a firm rule, required in its new circumstances a new political centre. The advisability of transferring the seat of government from Borne to a point farther east had been felt long before. The frequent wars against Persia, the repeated revolts of Asiatic nations, the incursions of tke Scythians, troubles at Borne, that old hot-bed of civil war, had already caused Diocletian to fix his residence at Nicomedia (now Ismid); and, indeed, Julius Csesar is said to have thought of transferring the capital to Alexandria Troas (Eski-Istambol), which, from its more central situation, would enable him the easier to keep the conquered nations in subjection. Constantine, however, was also actuated by other than strategic and political motives. The abandonment of Eome marked the establishment of Christianity as the State religion. The new capital was dedicated to the Virgin Mary; and the fact that the ceremony of its inauguration was performed solely by Christian ecclesiastics, and that no pagan temples were allowed to be erected in the new city, emphatically proclaimed the downfall of Paganism.

The new city was begun in 328 A.D. The Emperor himself marked out its boundaries, which included five of the seven hills enumerated on page 1. Setting out on foot, followed by a numerous retinue, and pretending that he was following the directions of a divine guide invisible to all save himself, with his spear he drew on the ground a line that crossed the triangular promontory at a distance of about two miles from the old fortifications. Along this line the new walls were erected, and on the 11th of May 330 A.D. the inaugural festivities were commenced, and lasted forty days.