Agrippa Postumus sibling Vipsania Agrippina
Marcus Agrippa Postumus (12 BC – AD 14), later named Agrippa Julius Caesar, was a Roman nobleman who was the youngest son of Marcus Vipsanius Agrippa and Julia the Elder, the daughter and only biological child of the Roman Emperor Augustus. Augustus initially considered Postumus as a potential successor, and formally adopted him as his heir, but banished him from Rome in AD 6 on account of his ferocia ("beastly nature"). In effect (though not in law), this action cancelled his adoption, and virtually assured Tiberius' emplacement as Augustus' sole heir. Postumus was ultimately executed by his own guards shortly after Augustus' death in AD 14.
Postumus was a member of the Julio-Claudian dynasty, the first imperial family of the Roman Empire. His maternal grandparents were Augustus and Scribonia, Augustus' second wife. He was also a maternal uncle of Emperor Caligula, who was the son of Postumus' sister Agrippina the Elder, as well as a great-uncle of Nero, the last Julio-Claudian emperor, whose mother Agrippina the Younger was Caligula's sister.Exile
In AD 6, an uprising began in the Roman province of Illyricum. Augustus sent Tiberius to crush the revolt with his army, and after a year of delayed results, he sent Germanicus in his capacity as quaestor to assist in bringing the war to a swift end. The reason, Dio says, that Germanicus was chosen over Postumus is because Postumus was of an "illiberal nature".Postumus was known for being brutish, insolent, stubborn, and potentially violent. He possessed great physical strength and reportedly showed little interest in anything other than fishing. He resisted all efforts to improve his behavior, forcing Augustus to "abdicate" him from the Julii in AD 6 and banish him to a villa at Surrentum, near Pompeii. As an abdicated adoptee (adoptatus abdicatus) he lost the Julian name and returned to the gens Vipsania. The ancient historian Velleius Paterculus had this to say of the banishment:
The following year, in 7 AD, Augustus had the Senate make Postumus' banishment permanent and had him moved to Planasia (modern Pianosa, Italy), a small island between Italy and Corsica. Augustus bolstered the natural inaccessibility of the rocky island by having an armed guard installed there. The Senate was ordered to never allow his release.No consensus has emerged as to why Augustus banished Postumus. Tacitus suggests that Augustus' wife Livia had always disliked and shunned Postumus, as he stood in the way of her son Tiberius succeeding to power after Augustus, given that Postumus was a direct biological descendant of Augustus and Tiberius was not. Some modern historians theorise that Postumus may have become involved in a conspiracy against Augustus. Postumus was held under intense security.Postumus' sister Julia the Younger was banished around the same time (AD 8) and her husband Lucius Aemilius Paullus was executed for allegedly plotting a conspiracy against Augustus. There was later a conspiracy to rescue Julia and Postumus by Lucius Audasius and Asinius Epicadus. Audasius was an accused forger of advanced age and Asinius was half-Illyrian. According to Suetonius, Audasius and Epicadus had planned to take Julia and Postumus by force to the armies. It is unclear what their exact plan was, or even which armies Suetonius was referring to, because the conspiracy was discovered early in its planning, possibly before they had even left Rome.
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