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I don't have enough context to write an accurate overview of "634." You've indicated only that the context is "year," but this doesn't tell me whether "634" refers to a historical year, an event, a work, a location, or something else entirely. Could you provide more specific context about what "634" is?
AI-generated from the Wikipedia summary — may contain errors.
Article
The Rashidun Caliphate invade the Levant Muslim invasion of Khalid ibn al-Walid in Syria
Year 634 (DCXXXIV) was a common year starting on Saturday of the Julian calendar. The denomination 634 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.