Medieval German nobility consisted of powerful landowners who held significant influence over their territories. They were often granted titles such as duke, count, or baron and managed large estates. Nobles played a crucial role in the feudal system, providing military service to the king in exchange for land and protection. These nobles were responsible for local governance, justice, and economic management within their domains. They often built fortified castles, which served as both residences and defensive structures. The relationships among the nobility were complex, involving alliances and rivalries that shaped the political landscape of Holy Roman Empire during the Middle Ages.