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I don't have enough context to provide an accurate overview of "664." You've indicated it's related to a year, but 664 could refer to several different historical events or subjects depending on the time period and field of study. Could you clarify what aspect of 664 you'd like me to explain?
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Ruins of Whitby Abbey (North Yorkshire)
Year 664 (DCLXIV) was a leap year starting on Monday of the Julian calendar. The denomination 664 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.