Final answer:
The serf is at the bottom of the feudal hierarchy.
Step-by-step explanation:
In the feudal hierarchy, the person at the bottom was the serf. Serfs were peasant farmers who worked on the lord's land and were bound to the land. They were not slaves, but they were not free either. Serfs were required to give a portion of their crops or labor to the lord in exchange for protection and the right to live on the land.
Learn more about feudal hierarchy