Castles were the indispensable pillars of medieval life because they functioned as much more than simple military fortifications; they were the centers of political, economic, and social order. Under the feudal system, a castle was the private residence of a lord and a sanctuary for the local community during times of war. Economically, they served as administrative hubs where taxes were collected and justice was dispensed in the lord's court. Socially, they were symbols of power that controlled important travel routes and trade paths. Rural life often revolved around the castle, with mills and markets situated nearby for protection. During peace, they were bustling households filled with servants, knights, and craftsmen, hosting grand festivities that represented the hierarchy of the age. Essentially, the castle provided the "security for labor" trade-off that defined the Middle Ages, where peasants worked the land in exchange for the lord's protection within the stone walls.