Medieval European feudal systems were hierarchical structures of land ownership and social relationships that dominated medieval society, primarily between the 9th and 15th centuries. This system was characterized by the exchange of land for military service, where lords granted land, known as fiefs, to vassals in return for loyalty and military aid. The feudal system significantly influenced settlement patterns, as it dictated where people lived based on the distribution of land and resources and established a socio-political framework that shaped the medieval landscape.