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I don't have sufficient context to write an accurate overview of "311." The single word "year" doesn't provide information about what 311 refers to (whether it's a phone number, law, band, or something else). Could you provide more context?
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Domitius Alexander (r. 308–311)
Year 311 (CCCXI) was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerius and Maximinus (or, less frequently, year 1064 Ab urbe condita). The denomination 311 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.