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In page Julio-Claudian dynasty:

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Following Augustus' ascension as the first emperor of the Roman Empire in 27 BC, his family became a de facto royal house, known in historiography as the "Julio-Claudian dynasty". For various reasons, the Julio-Claudians followed in the example of Julius Caesar and Augustus by utilizing adoption as a tool for dynastic succession. The next four emperors were closely related through a combination of blood relation, marriage and adoption.[citation needed]