Vitellius, however, when his brother joined him, and when those who are skilled in the arts of despotism began to creep into his confidence, grew more arrogant and cruel. He ordered the execution of Dolabella, whose banishment by Otho to the Colonia Aquinas I have before mentioned. Dolabella, on hearing of the death of Otho, had entered the capital. Plancius Varus, who had filled the office of prætor, and had been one of Dolabella's intimate friends, founded on this a charge, which he laid before Flavius Sabinus, prefect of the city, implying that Dolabella had escaped from custody, and had offered to put himself at the head of the vanquished party; and he also alleged that the cohort stationed at Ostia had been tampered with. Of these grave accusations he brought no proof whatever, and then repenting, sought, when the crime had been consummated, a pardon which could be of no avail. Flavius Sabinus hesitating to act in a matter of such importance, Triaria, the wife of Lucius Vitellius, with unfeminine ferocity, warned him not to seek a reputation for clemency by imperilling the Emperor. Sabinus was naturally of a mild disposition, but under the pressure of fear was easily swayed; here, the danger of another made him tremble for himself, and, lest he might seem to have helped the accused, he precipitated his fall.