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I don't have enough context to write an accurate overview of "331." You've indicated it's related to a year, but without additional information about what specifically happened in 331 AD, 331 BC, or what "331" refers to in another context, I cannot provide factual details that would be appropriate for a general reader. Could you provide more context about which "331" you're asking about?
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An image of the Church of the Holy Apostles (1162)
Year 331 (CCCXXXI) was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Bassus and Ablabius (or, less frequently, year 1084 Ab urbe condita). The denomination 331 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.