Once or twice he paused. As he did so, he became aware of the extraordinary, almost terrible stillness, that encompassed him. He felt it enclosing him like a thick wall on all sides. Earth and the air seemed breathless, as if in the throes of some mysterious excitement. The stars, flashing out with the brilliant lustre of the south, were as so many living eyes eagerly gazing down on the solitary human being whose steps led him into these deserted places. The moon herself seemed to stare at him in open wonderment. At last he found himself before the open portals of the great Church of Santa Maria of the Aventine. From the gloom within floated the scent of incense and the sound of chanting. He could see tapers gleaming on the high altar in the choir. Women were passing in and out, and a blind beggar sat at the gate. Moved more by curiosity than the desire for worship, Tristan entered and uncovered his head. The Byzantine cupola was painted in vermilion and gold. The slender pillars of white marble were banded with silver and inlaid with many colored stones. The basins for holy water were of black marble, their dark pools gleaming with the colors of the vault. Side chapels opened on either hand, dim sanctuaries steeped in mystery of incense-saturated dusk. The saints and martyrs in their stiff, golden Byzantine dalmaticas seemed to endow each relic with an air of mystery. The beauty and the mystery of the place touched Tristan's soul. As in a haze he seemed again to see the pomp and splendor of the sanctuaries of far-away, dream-lost Avalon. Tristan took his stand by one of the great pillars, and, setting his back to it, looked round the place. There were some women in the sanctuary, engaged in prayer. Tristan watched them with vacant eyes. Suddenly he became conscious that one of these worshippers was not wholly absorbed in prayer under her hood. Two watchful eyes seemed to consider him with a suggestiveness that no man could mistake, and her thoughts seemed to be very far from heaven. Once or twice Tristan started to leave the sanctuary, but some invisible hand seemed to detain him as with a magic hold. In due season the woman finished her devotions and stood with her hood turned back, looking at Tristan across the church. Her women had gathered about her and outside the gates Tristan saw the spear points of her guard. Turning, with a glance cast at him over her shoulder, she swept in state out of the church, her women following her, all save one tall girl, who loitered at the door. Suddenly it flashed upon Tristan, as he stood there with his back leaning against the pillar. Was not this the woman he had met by the fountain, the woman who had spoken strange words to him in the Navona?