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In page Julio-Claudian dynasty:

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Julius and Claudius were two Roman family names; in classical Latin, they came second. Roman family names were inherited from father to son, but a Roman aristocrat could—either during his life or in his will—adopt an heir if he lacked a natural son. In accordance with Roman naming conventions, the adopted son would replace his original family name with the name of his adopted family. A famous example of this custom is Julius Caesar's adoption of his great-nephew, Gaius Octavius.[citation needed]