The Duke of Berg was a noble title in the historical region of Berg, located in present-day Germany. The title was held by various rulers during the Middle Ages and the early modern period, particularly within the context of the Holy Roman Empire. The dukedom played a significant role in regional politics and was often involved in territorial disputes. In 1815, the title was absorbed into the Duchy of Berg, which became part of the Kingdom of Prussia. The area was known for its rich resources and strategic importance, contributing to the development of the surrounding regions. The title itself has since become largely historical, with no current holders.