"Barbarians", that is, barbarians in medieval Europe, are actually insulting terms used by ancient Greeks and Romans to their neighbors (Germans) and some Asian nations, just like the concept of inferiority and superiority of China and foreigners in the Spring and Autumn Period. They regard all non-Greek and Roman peoples as foreigners. However, it was these barbarians who pushed the once arrogant Roman Empire down the abyss of extinction. Barbarian wars generally refer to the Germanic tribes that overthrew the Roman Empire, including Vandals, Visigoths, ostrogoths, Franks, Angles, Saxons, Jutes and Picts. In the eyes of ancient Greeks and Romans, barbarians always lived on the edge of civilized society and were uncivilized. The endless struggle between tribes and the cruel living environment of nature are very sensitive; They worship the power of wild animals, so the legend of werewolves is often associated with barbarians.