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Atia (also Atia Balba) (85 BC – 43 BC) was the niece of Gaius Julius Caesar (through his sister Julia Minor), mother of Gaius Octavius, who became the Emperor Augustus, step-grandmother of the Emperor Tiberius, great-grandmother of the Emperor Claudius, great-great grandmother of the Emperor Caligula and Empress Agrippina the Younger, and great-great-great-grandmother of the Emperor Nero.