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The plague was caused by Yershia Pestis Bacteria, which was spread by Oriental Rat Fleas living on black rats round on merchant ships in the Mediterranean.
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The Bubonic Plague started in China and spread west along the Silk Road hitting Crimea in 1346 and in Europe around 1349. The plague reduced the entire worlds population by 40% to 60%
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Many of the people said the Jews poisoned the water and was causing the spread.
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The peasants learned they could come together and make governmental changes. They began to demand more money because they were fewer workers. More people also owned land than before.