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I don't have enough context to provide an accurate overview of "654" in relation to calendar years. Could you provide more specific information about what "654" refers to (such as a historical event, year in a particular calendar system, or other reference)?
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Article
Pope Eugene I (654–657)
Year 654 (DCLIV) was a common year starting on Wednesday of the Julian calendar. The denomination 654 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.