'''Arruns''', also spelled '''Aruns''', is an Etruscan praenomen, thought to mean "prince." Various figures in Roman legend and history were known by this name, including:

* Aruns, an ally of Troy in Roman legend who killed Turnus' ally Camilla, and was killed by the goddess Diana's companion Opis, sent by Diana to avenge Camilla and retrieve her corpse;<ref>''The New Century Classical Handbook'', Catherine Avery, ed., Appleton-Century-Crofts, New York (1962), p. 176.</ref> * Arruns Porsena, son of Lars Porsena, the legendary king of Clusium; * Arruns Tarquinius (son of Demaratus), the grandfather of Lucius Tarquinius Collatinus, one of the first Roman consuls in 509 BC; * Arruns Tarquinius (Egerius), the father of Lucius Tarquinius Collatinus; * Arruns Tarquinius (brother of Tarquin the Proud), murdered by his wife, Tullia, who subsequently married his brother, Lucius, the seventh and last King of Rome; * Arruns Tarquinius (son of Tarquin the Proud), slain in battle with Lucius Junius Brutus, colleague of Tarquinius Collatinus.

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