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I don't have enough context to write an accurate overview of "306." The information provided only indicates that "306" relates to a year, but doesn't specify which year, what historical event or significance it had, or why it matters. Could you provide additional context about what "306" refers to?
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Article
Constantine the Great (York)
Year 306 (CCCVI) was a common year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Constantius and Valerius (or, less frequently, year 1059 Ab urbe condita). The denomination 306 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.