Year 405 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Barbatus, Capitolinus, Cincinnatus, Medullinus, Iullus and Mamercinus (or, less frequently, year 349 Ab urbe condita). The denomination 405 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
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