The Black Death was a plague pandemic which devastated medieval Europe from 1347 to 1352 CE, killing an estimated 25-30 million people. The disease originated in central Asia and was taken to the Crimea by Mongol warriors and traders. The plague then entered Europe via Italy, carried by rats on Genoese trading ships sailing from the Black Sea.

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Original Article: https://www.worldhistory.org/Black_Death/