AI overview
I don't have enough context to provide an accurate overview of "684." The context provided only indicates it's a year, but without additional information about what specific event, work, person, or topic associated with 684 you're asking about, I cannot write a factual overview.
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Article
Pope Benedict II (684–685) Year 684 (DCLXXXIV) was a leap year starting on Friday of the Julian calendar. The denomination 684 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.
Events