a year later, having accused Gnaeus Calpurnius Piso, the governor of Syria, of poisoning him. The Pisones had been longtime supporters of the Claudians, and had allied themselves with the young Octavian after his marriage to Livia, the mother of Tiberius. Germanicus's death and accusations indicted the new Princeps. Piso was placed on trial and, according to Tacitus, threatened to implicate Tiberius. Whether the governor actually could connect the Princeps to the death of Germanicus is unknown; rather than continuing to stand trial when it became evident that the Senate was against him, Piso committed suicide. In AD 22, Tiberius shared his tribunician authority with his son Drusus, and began making yearly excursions to Campania that reportedly became longer and longer every year. In AD 23, Drusus died in mysterious circumstances, and Tiberius seems to have made no effort to elevate a replacement. In AD 26, Tiberius moved to an imperial villa-complex he had inherited from Augustus, on the island of Capri. It was just off the coast of Campania, which was a traditional holiday retreat for Rome's upper classes, particularly those who valued cultured leisure (otium) and a Hellenised lifestyle. Tiberius in Capri, with Sejanus in Rome Lucius Aelius Sejanus had served the imperial family for almost twenty years when he became Praetorian Prefect in AD 15. As Tiberius became more embittered with the position of Princeps, he began to depend more and more upon the limited secretariat left to him by Augustus, and specifically upon Sejanus and the Praetorians. In AD 17 or 18, Tiberius had trimmed the ranks of the Praetorian Guard responsible for the defence of the city, and had moved it from encampments outside of the city walls into the city itself, giving Sejanus access to somewhere between 6000 and 9000 troops. The death of Drusus elevated Sejanus, at least in the eyes of Tiberius, who thereafter refers to him as his 'Socius Laborum' (Partner of my labours). Tiberius had statues of Sejanus erected throughout the city, and Sejanus became more and more visible as Tiberius began to withdraw from Rome altogether. Finally, with Tiberius's withdrawal in AD 26, Sejanus was left in charge of the entire state mechanism and the city of Rome. Sejanus's position was not quite that of successor; he had requested marriage in AD 25 to Tiberius's niece, Livilla, though under pressure quickly withdrew the request. While Sejanus's Praetorians controlled the