Antonia Minor
The death of Gaius in AD 4 initiated a flurry of activity in the household of Augustus. Tiberius was adopted as full son and heir, and in turn he was required to adopt his nephew Germanicus, the son of his brother Drusus and Augustus' niece Antonia Minor. Along with his adoption, Tiberius received tribunician power as well as a share of Augustus' "maius imperium", something that even Marcus Agrippa may never have had.