How did Charlemagne lay the foundation for feudalism?

Charlemagne laid the foundation for feudalism by establishing a system of local governance and loyalty among his vassals. He granted lands, known as fiefs, to nobles in exchange for military service and support, creating a network of loyalty and obligation. This decentralized authority allowed local lords to manage their territories effectively while remaining loyal to Charlemagne, thereby promoting a hierarchical structure that characterized feudal society. Additionally, his emphasis on the protection of his realm fostered the need for knights and fortified positions, further entrenching feudal relationships.