The worst plague in European history, lasting from about 1347 to 1352. In this time, over 1/3 of Europe's population died from a combination of three diseases: the bubonic plague, the septicemic plague, and the pneumonic plague. They were known collectively as this, and victims died a terrible death. It was brought in on fleas on rats on international trade ships. There were no logical explanations - some common ones were that planets were aligned in a poisonous way, Jews were poisoning the drinking water, or it was punishment for sin.