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In page Julio-Claudian dynasty:

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No Julio-Claudian emperor was a blood descendant of his immediate predecessor. Although Tiberius and Claudius had potential heirs (Tiberius Gemellus, grandson of Tiberius through his son Drusus, and Britannicus, son of Claudius, respectively) available for the succession, both were, in turn, ultimately succeeded by their great-nephews Caligula and Nero, respectively.[citation needed]