The Duke of Beja is a noble title in Portugal, historically associated with the region of Beja in the Alentejo. The title was first created in the 15th century and has been held by various members of the Portuguese royal family. It signifies a rank of nobility and is often linked to the governance of the Beja area. Throughout history, the title has been associated with significant figures, including Prince Henry the Navigator, who played a crucial role in the Age of Discoveries. The title has also been passed down through generations, reflecting the changing dynamics of Portuguese nobility and its influence on the country's history.