ガイウス・カエサル
With Tiberius' departure, succession rested solely on Augustus' two young grandsons, Lucius and Gaius Caesar. The situation became more precarious in AD 2 with the death of Lucius. Augustus, with perhaps some pressure from Livia, allowed Tiberius to return to Rome as a private citizen and nothing more. In AD 4, Gaius was killed in Armenia, and Augustus had no other choice but to turn to Tiberius.