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Gaius Octavius (about 100 – 59 BC) was a Roman politician. He was an ancestor to the Roman Emperors of the Julio-Claudian dynasty. He was the father of the Emperor Augustus, step-grandfather of the Emperor Tiberius, great-grandfather of the Emperor Claudius, and great-great grandfather of the Emperors Caligula and Nero. Hailing from Velitrae, he was a descendant of an old and wealthy equestrian branch of the gens Octavia. At Rome his family was part of the wealthy plebeian caste, and not being of senatorial rank, he was a "novus homo" ("new man"). His grandfather, Gaius Octavius, fought as a military tribune in Sicily during the Second Punic War. His father, Gaius Octavius, was a municipal magistrate who lived to an advanced age.