The "Duke of Hereford" is a title in the English peerage, historically associated with the region of Herefordshire. The title has been held by various noble families, most notably by Henry Bolingbroke, who became King Henry IV of England after deposing King Richard II. The title signifies a rank of nobility and is often linked to land ownership and political influence in medieval England. The title has been used intermittently throughout history, with its significance varying over time. It is part of the broader system of titles in the British aristocracy, which includes dukes, earls, and barons. The Duke of Hereford remains a symbol of the historical power dynamics within the English nobility.