The abbot, who had made several visits to Constantinople upon the business of his monastery, walked with the assured step of one who knows his ground; while the boy, alarmed and yet pleased by the rush of people, the roar and clatter of passing chariots, and the vista of magnificent buildings, held tightly to the loose gown of his guide, while staring eagerly about him in every direction. Passing through the steep and narrow streets which led up from the water, they emerged into the open space which surrounds the magnificent pile of Saint Sophia, the great church begun by Constantine, hallowed by Saint Chrysostom, and now the seat of the Patriarch, and the very centre of the Eastern Church. Only with many crossings and genuflections did the pious abbot succeed in passing the revered shrine of his religion, and hurried on to his difficult task. Having passed Saint Sophia, the two travellers crossed the marble-paved Augusteum, and saw upon their right the gilded gates of the hippodrome through which a vast crowd of people was pressing, for though the morning had been devoted to the religious ceremony, the afternoon was given over to secular festivities. So great was the rush of the populace that the two strangers had some difficulty in disengaging themselves from the stream and reaching the huge arch of black marble which formed the outer gate of the palace. Within they were fiercely ordered to halt by a gold-crested and magnificent sentinel who laid his shining spear across their breasts until his superior officer should give them permission to pass. The abbot had been warned, however, that all obstacles would give way if he mentioned the name of Basil the eunuch, who acted as chamberlain of the palace and also as Parakimomen--a high office which meant that he slept at the door of the Imperial bed-chamber. The charm worked wonderfully, for at the mention of that potent name the Protosphathaire, or Head of the Palace Guards, who chanced to be upon the spot, immediately detached one of his soldiers with instructions to convoy the two strangers into the presence of the chamberlain.