Marcius Agrippa
Marcius Agrippa was originally a slave serving as a beautician. He later became a freedman in some unknown way and then started to encroach upon the rank of Equestrian, serving as advocatus fisci during the reign of Septimius Severus. His impersonation of a man of higher rank was discovered shortly afterwards, and the emperor exiled him to an island. He was called back to Rome by the emperor Caracalla, probably given a grant of ingenuitas, and he was elevated to senatorial rank. He was appointed by the emperor Macrinus in 217, first to the government of Pannonia and afterwards to that of Dacia.
Agrippa is almost certainly the same person as the Marcius Agrippa, Roman admiral, who is mentioned by the Augustan histories "as privy to the death of Antoninus Caracallus."