"The Rubicon is passed," he muttered. "The stars—or the abyss."

Then, slowly quitting the stupendous ruins of the Amphitheatre, he took the direction of the Catacombs of St. Calixtus.


[CHAPTER VII]
THE FACE IN THE PANEL

On the following day Tristan entered upon his duties as captain of the Senator's guard.

The first person upon whom he chanced on his rounds at the Lateran was the Grand Chamberlain, who inquired affably how his penitences were progressing and expressed the hope that he had received final absolution, and that his sins would not weigh too heavily upon his soul. Basil commended him for his zeal in the cause of the Senator, hinting incidentally that his duties between the Lateran and Castel San Angelo need not deprive him of the society of the fair Roman ladies, who would welcome the stranger from Provence and would doubtlessly enmesh his heart, if it were not well guarded. He then proceeded to caution Tristan with respect to his exalted prisoner. Numerous attempts at abduction had been made from time to time, Tristan having, by his prowess and daring, prevented the last, emanating doubtlessly from the Pontiff's nearest kith and kin. The men under him could be fully relied upon. Nevertheless, it behooved him to be circumspect.

After a time Basil departed, and Tristan went about his business, inspecting the guard and familiarizing himself with the place where he was to keep his first watch.

The level beams of the evening sun filled the Basilica of St. John in Laterano. There were pearl lights and lights of sapphire; falling radiances of emerald and blood-red; vague translucent greens, that seemed to tremble under spiral clouds of incense.

Now the sun was sinking behind Mount Janiculum. The clouds at the zenith of the heavens were rose-hued, but it was growing dark in the valleys, and the great church began to take on sombre hues. It seemed to frown upon him, to warn him not to enter, an impression he was long afterwards to remember, as he strode through the high-vaulted corridors.