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In page Julio-Claudian dynasty:

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With his adoption on 25 February AD 50, Nero became heir to the throne, over Claudius' own son Britannicus. Claudius died on 13 October AD 54, and Nero became emperor. A number of ancient historians accuse Agrippina of poisoning Claudius, but details on these private events vary widely.[citation needed] These events are recounted in book 12 of the Annals of Tacitus, book 61 of Cassius Dio's Roman History, and in the biographies of Nero and Claudius by Suetonius.