All along the western side of the Augustaeum, facing the three buildings which we have already described, lay an edifice which played a very prominent part in the public life of Constantinople. This was the great Hippodrome, a splendid circus 640 cubits long and 160 broad, in which were renewed the games that Old Rome had known so well. The whole system the chariot-races between the teams that represented the “factions” of the Circus was reproduced at Byzantium with an energy that even surpassed the devotion of the Romans to horse racing. From the first foundation of the city the rivalry of the “Blues” and the “Greens” was one of the most striking features of the life of the place. It was carried far beyond the circus, and spread into all branches of life. We often hear of the “Green” faction identifying itself with Arianism, or of the “Blue” supporting a pretender to the throne. Not merely men of sporting interests, but persons of all ranks and professions, chose their colour and backed their faction. The system was a positive danger to the public peace, and constantly led to riots, culminating in the great sedition of A.D. 523, which we shall presently have to describe at length. In the Hippodrome the “Greens” always entered by the north-eastern gate, and sat on the east side; the “Blues” approached by the north-western gate and stretched along the western side. The emperor’s box, called the Kathisma, occupied the whole of the short northern side, and contained many hundreds of seats for the imperial retinue. The great central throne of the Kathisma was the place in which the monarch showed himself most frequently to his subjects, and around it many strange scenes were enacted. It was on this throne that the rebel Hypatius was crowned emperor by the mob, with his own wife’s necklace for an impromptu diadem. Here also, two centuries later, the Emperor Justinian II. sat in state after his reconquest of Constantinople, with his rivals, Leontius and Apsimarus, bound beneath his footstool, while the populace chanted, in allusion to the names of the vanquished princes, the verse, “Thou shalt trample on the Lion and the Asp.”