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I don't have sufficient context provided to write an accurate overview of "431 BC." The context label "year" alone doesn't contain information about what specifically happened in 431 BC or why it might matter historically. Could you provide more details about what aspect of 431 BC you'd like me to focus on?
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Article
Year 431 BC was a year of the pre-Julian Roman calendar. At the time, to Romans it was known as the Year of the Consulship of Cincinnatus and Mento (or, less frequently, year 323 Ab urbe condita). The denomination 431 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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