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I don't have sufficient context to write an accurate overview of "291." The single word "year" doesn't provide enough information about what "291" refers to—whether it's a historical year, publication, artwork, event, or something else. Could you provide more context so I can write an accurate overview?
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Article
Hunping jar of the Jin Dynasty
Year 291 (CCXCI) was a common year starting on Thursday of the Julian calendar. At the time, it was known in Rome as the Year of the Consulship of Tiberianus and Dio (or, less frequently, year 1044 Ab urbe condita). The denomination 291 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.