The Black Plague or Black Death was a very VERY bad disease. It killed .more than 25% of europes population. That's about 20 million people. It slowly faded out in 2 years but then came back every now and then but now we don't have it because of hygiene and how smart we are we also have medicine now but they didn't, they thought that it was a punishment from god. If you got the plague than you would die within 2 days. If you got it , you would first get pains then boils then they could pop and black stuff would come out and lastly you could possibly die.