The black death that's going to kill upwards of 100 million people in Europe in a less than 10 year time span. But it's important to mention that there are actually three huge plague outbreaks. The first one was in the 6th century, the Byzantine Empire, the Eastern Roman Empire where it's going to attack Constantinople, it's going to go on to kill in a very short period of time about 25 million people eventually. Probably more as these plagues seem to have outbreaks after they end for the next 50, 100, 200 years. And then the second outbreak is going to be the one that occurs in the 14th century, in the 1330s, 1340s, 1350s. This is the big one, the great plague, the black plague which we're going to focus on. But later on the plague is going to be back.