Agrippina the Elder
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 the 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.