Europe is called the Middle Ages from 500 A.D. to 1500 A.D. and has always been regarded as the darkest period in Europe. The invasion and settlement of barbarians caused the collapse of the Roman Empire and almost caused the complete destruction of European culture at that time. In this context, the feudal system in western Europe was produced and developed on the ruins after the fall of Rome through the integration of Germanic, Roman and Christian factors. Chivalry system also came into being in medieval Europe, which was a feudal vassal system gradually produced and established in the process of feudalization in Europe. European countries in the Middle Ages were a loose collection of territories. In a country, emperors, kings, dukes, etc. Are the supreme lords, and other big noble swore allegiance to them in exchange for fiefs-"fiefs", thus becoming vassals of the supreme lords. These vassals can have their own vassals until knights with little or no land, thus forming a complete feudal hierarchy in Western Europe.