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I don't have enough context to provide an accurate overview of "631." To write a factual, neutral explanation based solely on the information you've provided, I would need more details about what "631" refers to—whether it's a historical year, a law, a scientific measurement, a location code, or something else entirely.
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Article
King Sisenand (c. 605–636)
Year 631 (DCXXXI) was a common year starting on Tuesday of the Julian calendar. The denomination 631 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.