Livia Drusilla, also known as Julia Augusta after her formal adoption into the Julian family in AD 14, was the wife of the Roman emperor Augustus Caesar throughout his reign, as well as his adviser. She was the mother of the emperor Tiberius, great-grandmother of the emperor Caligula, grandmother of the emperor Claudius, and the great-great-grandmother of the emperor Nero. She was deified by Claudius who acknowledged her title of Augusta.