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I don't have sufficient context to provide an accurate overview of "676" beyond knowing it refers to a year. Without additional information about what specific historical events, cultural significance, or other meaning "676" holds, I cannot write an informed overview for a general reader.
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King Dagobert II of Austrasia (c. 650–679)
Year 676 (DCLXXVI) was a leap year starting on Tuesday of the Julian calendar. The denomination 676 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.