The Habsburg Monarchy or Empire (occasionally also styled as the Austrian Monarchy and Danubian Monarchy) is an unofficial among historians for the countries and provinces that were ruled by the junior Austrian branch of the House of Habsburg until 1780 and then by the successor branch of Habsburg-Lorraine until 1918. The Monarchy was a composite state composed of territories within and outside the Holy Roman Empire, united only in the person of the monarch. The dynastic capital was Vienna, except from 1583 to 1611, when it was moved to Prague. From 1804 to 1867 the Habsburg Monarchy was formally unified as the Austrian Empire, and from 1867 to 1918 as the Austro-Hungarian Empire.