The fall of the Roman Empire, and the invasions of barbarian tribes, devastated European towns and cities and their inhabitants. The Dark Ages are given this name because Europe was in disarray in comparison to the orderliness of classical antiquity and life was short and poor. Much of the knowledge that the Romans used (science, technology, medicine, and literature) was lost. The Dark Ages period was marked by mass migrations, wars and plagues. This lasted some 300 years until the development of feudalism partly diminished the continuous violence. Emperor Charlemagne was crowned in 800 , and he promoted order, education and civilization. Europe began to slowly regain what was lost during those centuries. The Late Middle Age was a tough period due to the Bubonic Plague and more wars which killed millions of people in Europe and Asia.