The Hohenzollerns are a prominent German noble family that played a significant role in European history. They originated in the 11th century and became known for their leadership in the regions of Brandenburg and Prussia. The family produced several notable rulers, including Frederick the Great, who expanded Prussia's territory and influence in the 18th century. In the 19th century, the Hohenzollerns established the German Empire, with Wilhelm I as its first emperor. The family's reign continued until the end of World War I in 1918, when the monarchy was abolished. Today, the Hohenzollerns are known for their historical significance and contributions to German culture and politics.