What contributed to the emergence of medieval civilization?

This was facilitated by the collapse of the Roman Empire and the further formation of barbarian kingdoms. So at the end of the 5th century AD, the Germans were able to create their kingdoms on the territory of the former Western Roman Empire. These kingdoms in the further history (that is, in the history of Europe) of the Middle Ages played a very important role. We can say that it was with them that a new stage in history began, which was called the Middle Ages.