Agrippa Postumus, Roman son of Marcus Vipsanius Agrippa and Julia the Elder (d. 14)
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.