Seius Strabo, who had been made one of the prefects of the prætorian cohorts by Augustus, had a son, who, having been adopted by one of the Ælian family, was named in the usual manner L. Ælius Sejanus. This young man, who was born at Vulsinii in Tuscany, was at first attached to the service of Caius Cæsar, after whose death he devoted himself to Tiberius; and such was his consummate art, that this wily prince, dark and mysterious to all others, was open and unreserved to him. Sejanus equalled his master in the power of concealing his thoughts and designs; he was daring and ambitious, and he possessed the requisite qualities for attaining the eminence to which he aspired; for though proud he could play the flatterer; he could and did assume a modest exterior, and he had vigilance and industry, and a body capable of enduring any fatigue. [Sidenote: [14-24 A.D.]] When Drusus was sent to quell the mutiny of the Pannonian legions, Sejanus, whom Tiberius had made colleague with his father Strabo in the command of the prætorians, accompanied him as his governor and director. Strabo was afterwards sent out to Egypt, and Sejanus was continued in the sole command of the guards; he then represented to Tiberius how much better it would be to have them collected into one camp instead of being dispersed through the city and towns, as they would be less liable to be corrupted, would be more orderly, and of greater efficiency if any insurrection should occur. A fortified camp was therefore formed for them near the Viminal Gate, and Sejanus then began to court the men, and he appointed those on whom he could rely to be tribunes and centurions. While thus securing the guards, he was equally assiduous to gain partisans in the senate, and honours and provinces only came to those who had acquired his favour by obsequiousness. In all these projects he was unwittingly aided by Tiberius, who used publicly to style him “the associate of his labours,” and even allowed his statues to be placed and worshipped in temples and theatres, and among the ensigns of the legions.