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I don't have sufficient context about "1491" to write an accurate overview. To provide you with a reliable 2-sentence summary, I would need information about what "1491" refers to—whether it's a book, historical event, or something else—and details about its significance. Could you provide more context about what "1491" is?
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Article
December 6: The completion of the conquest of Brittany by France is effected by the marriage of King Charles VIII to the Duchess Anne.
Year 1491 (MCDXCI) was a common year starting on Saturday of the Julian calendar.