 His maternal grandparents were the triumvir Mark Antony and Augustus's sister Octavia Minor.Germanicus was a key figure in Julio-Claudian dynasty of the early Roman Empire.As well as being the great-nephew of Augustus, he was the nephew of the second emperor, Tiberius, his son Gaius would become the third emperor, Caligula, who would be succeeded by Germanicus' brother Claudius, and his grandson would become the fifth emperor, Nero.