- The Black Death was called the Great Pestilence, Great Plague, or Great Mortality in the Middle Ages.
- The term Black Death came into use in Denmark or Sweden during the 16th century.
- The plague was caused by bacteria of the species Yersinia pestis.
- The plague infected rat populations and was spread, both among the rats and to humans, by their fleas.
- The plague killed rats, fleas, an humans alike.
- The plague was spread along trade routes. It entered Europe through the Crimea, Constantinople, and Southern France from Asia and the Middle East.
- It started in Europe in 1347 and spread until 1351. It spread through nearly all of Europe.
- It is believed to have killed 60 million people in Europe and 25 million in Asia, though figures vary widely.
- It caused great changes in society, including reduction in the power of the Church and great weakening of the feudal system.
- It returned many times during and after the Middle Ages.
There is a link below to an article on the plague.