When the young Empress had withdrawn, Titus beckoned to her faithful freedwoman Pythias, and told her to send for Onesimus. He came, and Titus, after slipping into his hand an aureus, which the Empress had left for him as a reward for his faithful warning, begged him to be on the alert, and to return in an hour. The Phrygian went to Acte, and told her all that had occurred. She kept him near at hand, and in a short time informed him that two of Nero’s worst creatures --Tigellinus and Doryphorus--were closeted with the Emperor, and that there was too much reason to fear that some deadly measure would be attempted that evening. Such was indeed the case. For now, to the joy of Tigellinus, Nero had openly declared that Britannicus must be swept out of his path; had even admitted to him that poison had been attempted, and had failed. ‘How soon do you wish the deed to be done?’ asked the wicked adventurer. ‘If we are to prevent some accursed plot,’ said Nero, ‘it cannot be too soon.’ ‘To-night?’ ‘To-night, if you will,’ answered Nero, ‘but it must be secret. There must be no scandal. A story must be trumped up. The Augusta must be deceived. Octavia must be deceived. None of his adherents must know of it, unless they can be trusted to hold their tongues.’ ‘Nearly all the people about him are in our pay,’ said Tigellinus. ‘I think it can be done.’ That night no soldier was on guard near the room of Britannicus, and Titus regarded this as a fatal sign. When he received from Onesimus the intelligence which Acte had given him, he said that he would draw his own bed across the door of the Prince’s room inside, so that none could enter without his knowledge. He asked Onesimus to keep watch in concealment outside, and make a noise if any one should approach. ‘I can imitate exactly the bark of the Empress’s lap-dog,’ said Onesimus, ‘for Aponia, who has charge of it, often lets me tease it. If I make this noise in the quiet of the night it is sure to set other dogs barking, and then I will spring out of my hiding-place as if the sound had awoke me.’ Proud of the confidence reposed in him, proud to be the guard of a Cæsar’s life, Onesimus put on a black lacerna, shrouded himself in a dark corner, hidden behind the shield of an Amazon. The Palace sank to deep silence, broken only by the faint, distant tramp of the sentinel who kept watch outside the passage which led to the cubiculum of the Emperor. About an hour after midnight he heard a stealthy footstep approaching, and saw the occasional gleam of a lantern which was hidden under the cloak of the murderer. Breathless with anxiety, he watched and listened. The slave came near to the room of Britannicus. Noiselessly he placed his lantern on the floor, then he drew a large dagger, and Onesimus saw its blade flash in the light as the wretch examined it. One instant more and his hand was thrusting an oiled key into the lock.