AI overview
I don't have enough context to provide an accurate overview of "657." The single word "year" doesn't clarify whether 657 refers to a specific historical year, an event, a person, or something else entirely. I'd need more specific information to write an accurate explanation.
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Article
Pope Vitalian (657–672)
Year 657 (DCLVII) was a common year starting on Sunday of the Julian calendar. The denomination 657 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.