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I don't have sufficient context to write an accurate overview of "1531" based only on the word "year." To provide a plain-language explanation of what happened in 1531 and why it matters, I would need more specific information about which historical event, person, or development you're asking about. Could you provide additional context?
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Article
August 22: The Battle of Obertyn is fought between Poland and Moldova
Year 1531 (MDXXXI) was a common year starting on Sunday of the Julian calendar.