The Bubonic plague killed around 1.5 million people in England, as well as millions more in Europe. It was called the Black Death because of the dark marks which formed around buboes. It's believed that the disease came from bacterium in fleas, which came to Europe from the Gobi Desert which jumped on by rats in Europe. Due to bad santitation and a lack of knowledge, many preventable deaths occured. Symptoms included buboes that filled with pus, delirium, high fever, vomiting, bleeding of the lungs, extreme fatigue and eventually death.