 His connection to the Julii was further consolidated through a marriage between himself and Agrippina the Elder, a granddaughter of Augustus.He was also the older brother of Claudius, the father of Caligula, and the maternal grandfather of Nero.During the reign of Augustus, Germanicus enjoyed an accelerated political career as the heir of the emperor's heir, entering the office of quaestor five years before the legal age in AD 7.