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In page Roman naming conventions:

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The development of the nomen as the second element of the Italic name cannot be attributed to a specific period or culture.[citation needed] From the earliest period it was common to both the Indo-European speaking Italic peoples and the Etruscans.[citation needed] The historian Livy relates the adoption of Silvius as a nomen by the kings of Alba Longa in honour of their ancestor, Silvius.[i][4] As part of Rome's foundation myth, this statement cannot be regarded as historical fact, but it does indicate the antiquity of the period to which the Romans themselves ascribed the adoption of hereditary surnames.[citation needed][ii]