AI overview
I don't have enough context to write an accurate overview of "641." The word "641" could refer to many different things (a year, a number, a highway, a statute, etc.), and you've only provided "year" as context, which isn't specific enough to determine which meaning is intended. Could you clarify what 641 refers to?
AI-generated from the Wikipedia summary — may contain errors.
Article
Emperor Constans II (630–668)
Year 641 (DCXLI) was a common year starting on Monday of the Julian calendar. The denomination 641 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.