The document discusses the Barbarian invasions of Europe during the fall of the Roman Empire and the early Middle Ages. Major invasions came from Germanic tribes from northern Europe like the Goths, Huns, Lombards, and Franks, as well as the Huns and Magyars from Asia. These invaders settled across Europe and established new political entities, with varying levels of adoption of Roman culture. Significant leaders that arose included Clovis who established the Frankish kingdom and Charlemagne who founded the Carolingian Empire. Vikings also raided much of Europe in this period. Feudalism developed as a political and economic system in response to these invasions and the need for protection.