 She was the first great-grandchild of Emperor Augustus and the noblewoman Scribonia, being the firstborn child of Julia the Younger, who was their only daughter Julia the Elder's first daughter.Her father was Lucius Aemilius Paullus, who was the son of Lucius Aemilius Lepidus Paullus, and grandson of Lucius Aemilius Lepidus Paullus, and therefore a great-nephew of the triumvir Lepidus, and of a distinguished and ancient patrician family, the Aemilii Lepidi.She may possibly have a brother named Marcus Aemilius Lepidus (6-39) who was married to Caligula's favorite sister Julia Drusilla.