From Virgil, Aeneid, Book 10, 284, where the first word is in the archaic form audentis. Allegedly the last words of Pliny the Elder before he left the docks at Pompeii to rescue people from the eruption of Vesuvius in 79. Often quoted as audaces fortuna iuvat. Also the motto of the Portuguese Army Commandos and the USS Montpelier (SSN-765) in the latter form.
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