When once Constantine had determined to make Byzantium his capital, in preference to any other place in the Balkan lands, his measures were taken with his usual energy and thoroughness. The limits of the new city were at once marked out by solemn processions in the old Roman style. In later ages a picturesque legend was told to account for the magnificent scale on which it was planned. The emperor, we read, marched out on foot, followed by all his court, and traced with his spear the line where the new fortifications were to be drawn. As he paced on further and further westward along the shore of the Golden Horn, till he was more than two miles away from his starting-point, the gate of old Byzantium, his attendants grew more and more surprised at the vastness of his scheme. At last they ventured to observe that he had already exceeded the most ample limits that an imperial city could require. But Constantine turned to rebuke them: “I shall go on,” he said, “until He, the invisible guide who marches before me, thinks fit to stop.” Guided by his mysterious presentiment of greatness, the emperor advanced till he was three miles from the eastern angle of Byzantium, and only turned his steps when he had included in his boundary line all the seven hills which are embraced in the peninsula between the Propontis and the Golden Horn. The rising ground just outside the walls of the old city, where Constantine’s tent had been pitched during the siege of A.D. 323, was selected out as the market-place of the new foundation. There he erected the _Milion_, or “golden milestone,” from which all the distances of the eastern world were in future to be measured. This “central point of the world” was not a mere single stone, but a small building like a temple, its roof supported by seven pillars; within was placed the statue of the emperor, together with that of his venerated mother, the Christian Empress Helena. The south-eastern part of the old town of Byzantium was chosen by Constantine for the site of his imperial palace. The spot was cleared of all private dwellings for a space of 150 acres, to give space not only for a magnificent residence for his whole court, but for spacious gardens and pleasure-grounds. A wall, commencing at the Lighthouse, where the Bosphorus joins the Propontis, turned inland and swept along parallel to the shore for about a mile, in order to shut off the imperial precinct from the city. [Illustration] The Heart of Constantinople