 Rumor had it that Livia was behind the death of Augustus' nephew Marcellus in 23 BC.After Julia's two elder sons by Marcus Vipsanius Agrippa, whom Augustus had adopted as sons and successors, had died, the one remaining son, Agrippa Postumus, was adopted at the same time as Tiberius, but later Agrippa Postumus was sent into exile and finally killed.Tacitus charges that Livia was not altogether innocent of these deaths and Cassius Dio also mentions such rumours.