imperial post, and therefore the information that Tiberius received from Rome and the information Rome received from Tiberius, the presence of Livia seems to have checked his overt power for a time. Her death in AD 29 changed all that. Sejanus began a series of purge trials of Senators and wealthy equestrians in the city of Rome, removing those capable of opposing his power as well as extending the imperial (and his own) treasury. Germanicus's widow Agrippina the Elder and two of her sons, Nero Julius Caesar and Drusus Caesar were arrested and exiled in AD 30 and later all died in suspicious circumstances. In Sejanus's purge of Agrippina the Elder and her family, Caligula, Agrippina the Younger, Julia Drusilla, and Julia Livilla were the only survivors. In 31, Sejanus held the consulship with Tiberius in absentia, and began his play for power in earnest. Precisely what happened is difficult to determine, but Sejanus seems to have covertly attempted to court those families who were tied to the Julians and attempted to ingratiate himself with the Julian family line to place himself, as an adopted Julian, in the position of Princeps, or as a possible regent. Livilla was later implicated in this plot and was revealed to have been Sejanus's lover for several years. The plot seems to have involved the two of them overthrowing Tiberius, with the support of the Julians, and either assuming the Principate themselves, or serving as regent to the young Tiberius Gemellus or possibly even Caligula. Those who stood in his way were tried for treason and swiftly dealt with. In AD 31 Sejanus was summoned to a meeting of the Senate, where a letter from Tiberius was read condemning Sejanus and ordering his immediate execution. Sejanus was tried, and he and several of his colleagues were executed within the week. As commander of the Praetorian Guard, he was replaced by Naevius Sutorius Macro. Tacitus claims that more treason trials followed and that whereas Tiberius had been hesitant to act at the outset of his reign, now, towards the end of his life, he seemed to do so without compunction. The hardest hit were those families with political ties to the Julians. Even the imperial magistracy was hit, as any and all who had associated with Sejanus or could in some way be tied to his schemes were summarily tried and executed, their properties seized