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I don't have sufficient context to provide an accurate overview of "688." The word "year" alone doesn't clarify whether you're referring to a historical year, a model number, a cultural reference, or something else entirely. Could you provide additional context about what "688" refers to?
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Article
King Cunipert of the Lombards (688–700)
Year 688 (DCLXXXVIII) was a leap year starting on Wednesday of the Julian calendar. The denomination 688 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.