The enthusiasm with which he was welcomed, not only by the populace, but by the emperor's own praetorians, was so great that the earliest pretext was seized to remove him from the capital.
In the next year, on the I I th of March, Heliogabalus was murdered, and Alexander was proclaimed emperor by the Praetorians and accepted by the senate.
That the predominance of the praetorians was already established is clear from the fact that Wathiq gave to two Turkish generals, Ashnas and Itakh respectively, the titular but lucrative supreme government of all the western and all the eastern provinces.
He was the son of Seius Strabo, prefect of the praetorians, and was adopted into the Aelian gens.
He gained the confidence of Tiberius, and, supported by the praetorians, whom he concentrated in a camp on the Viminal Hill, became virtually ruler of Rome.