Fiefs, also known as feudal estates, were granted by lords to vassals in the feudal system. Synonyms for fiefs include land grants, manors, estates, holdings, territories, and dominions. These terms all refer to land that is owned and controlled by a lord or vassal. Feudal societies were characterized by the exchange of land for allegiance and military service, and fiefs were the primary means of ensuring loyalty and obedience among vassals. In some cases, fiefs could also include buildings, serfs, and other resources necessary for maintaining the lord's power. Though the feudal system no longer exists, the concept of fiefs continues to influence modern politics and economics.