Feudal domains were a system of land ownership and political power in medieval Europe. Fiefs were the basic unit of this system, and were granted by a lord to a vassal in exchange for loyalty and service. The fiefs were usually made up of land, but could also include other rights and privileges. The lord had the right to collect taxes from the fiefs, and the vassal was expected to provide military service to the lord when needed. This system of feudalism was an important part of the social and political structure of medieval Europe.