Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Aruns

An Etruscan word which was regarded by the Romans as a proper name, but perhaps signified a younger son in general.

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1.

Younger brother of Lucumo, i. e. L. Tarquinius Priscus.

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2.

Younger brother of L. Tarquinius Superbus; was murdered by his wife.

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3.

Younger son of Tarquinius Superbus; fell in combat with Brutus.