Final answer:
Feudalism was the economic system in medieval Europe based on land tenure and hierarchical relationships between lords, knights, and serfs.
Step-by-step explanation:
Feudalism was the economic system that prevailed in medieval Europe. It was based on land tenure and the relationship between the tenant and the landowner. This system was related to the Roman custom of patronage and incorporated elements of Roman, Christian, and Germanic traditions. Feudalism involved a hierarchical structure where lords owned the land, knights provided military service, and serfs worked the land in exchange for protection.