When the Roman empire fell, there was no law enforcers anywhere, this meant that robbers became a usual thing and since the Serfs who were th ebottom of the social structure but also the greatests producers in agriculture and farms were being abused by the thiefs, they seeked protection from lords all over Europe, this meant that the Lord from certain place would offer protection and payed law enforces in exchange for grains, animals and crops. This is the start of the feudal system.
After the fall of Rome, there was no central government or organization. People looked for protection from powerful lords This relationship led to the feudal system. The king held all the power, and it trickled down to nobles. The serfs were at the bottom of the social structure and relied on nobles to keep them safe.
