The House of Habsburg-Lorraine is a European royal family that emerged in the 18th century from the union of the House of Habsburg and the House of Lorraine. This dynasty played a significant role in European history, particularly in the realms of Austria and Hungary, and produced several notable rulers, including Emperor Francis I and Marie Antoinette. The family was influential in the politics of Europe, often intermarrying with other royal houses to strengthen alliances. The Habsburg-Lorraine lineage continued to impact European affairs until the end of the Austro-Hungarian Empire in 1918, marking the decline of their political power.