Nero Claudius Drusus
Claudius's maternal grandparents were Mark Antony and Octavia Minor, Augustus's sister, and he was therefore the great-great grandnephew of Gaius Julius Caesar. His paternal grandparents were Livia, Augustus' third wife, and Tiberius Claudius Nero. During his reign, Claudius revived the rumor that his father Nero Claudius Drusus was actually the illegitimate son of Augustus, to give the appearance that Augustus was Claudius' paternal grandfather.