The House of Welf is a prominent noble family originating from the medieval period in Europe. It has roots in the region of Lower Saxony, Germany, and played a significant role in the politics and governance of various territories. The family is known for producing several influential rulers, including dukes and kings. Throughout history, the Welfs were often in conflict with the House of Hohenstaufen, another powerful noble family. The rivalry between these two houses significantly impacted the political landscape of the Holy Roman Empire. The Welfs also contributed to the development of several cities and regions in Germany and beyond.