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I don't have enough context to write an accurate overview of "656." The single word "year" doesn't clarify whether 656 refers to a historical year, a document, a code, or something else entirely. Could you provide more specific context about what "656" is?
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Article
King Sigebert III of Austrasia (c. 630–656)
Year 656 (DCLVI) was a leap year starting on Friday of the Julian calendar. The denomination 656 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.