Germanicus Julius Caesar . Born in Lugdunum, Gaul , was a member of the Julio-Claudian dynasty of the early Roman Empire. At birth he was named either Nero Claudius Drusus after his father or Tiberius Claudius Nero after his uncle, and received the agnomen Germanicus, by which he is principally known, in 9 BC, when it was awarded to his father in honour of his victories in Germania. He was the father of the Roman emperor Caligula, brother of the emperor Claudius, and grandfather of the emperor Nero.