AI overview
I don't have sufficient context to write an accurate overview of "640." The context provided only indicates "year," but doesn't clarify what "640" specifically refers to—whether it's the year 640 CE, a historical event, a location, or something else entirely. I'd need more specific information to provide an accurate and helpful overview.
AI-generated from the Wikipedia summary — may contain errors.
Article
Year 640 (DCXL) was a leap year starting on Saturday of the Julian calendar. The denomination 640 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