AI overview
I don't have sufficient context about "423 BC" to write an accurate overview. The single word "year" doesn't provide information about what specifically happened in 423 BC or why it might matter historically. Could you provide more context about what "423 BC" refers to?
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Article
Year 423 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Atratinus and Ambustus (or, less frequently, year 331 Ab urbe condita). The denomination 423 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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