The Bubonic Plague was a disease carried by rodents. It was caused by bacteria named Yersinia pestis that was found in the intestines of the fleas on the rodents. The bacteria blocked the intestines of the fleas causing the fleas to starve which made the fleas want to feed often. The fleas would try to clear the blockage by vomiting. When the fleas vomited up the bacteria when they were feeding on someone, that bacteria would get into the bite and that person would become infected with the disease. The plague was also called the Great Pestilence, the Great Plague, and the Great Mortality. People also called it the Black Death because it left boils all over their body that turned black. The plague is believed to have begun in 1331
