Austria
The Holy Roman empire and, evetually, the Austria-Hungry. Marie Antoinette was a Habsburg.
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They both were not in an empire together. Rather Austria was part of the Habsburg empire. Prussia was a growing nation of its own.
Austria, Hungary, Bohemia, and the Habsburg dominions. In the War of the Austrian Succession (1740-48), she lost Silesia.
domestic affairs
Austro-Hungary was ruled by an Emperor from the Habsburg family in 1914.
Karl von Habsburg was named the Prince Imperial of Austria in 2007. He has never reigned because Austria has not had a king or queen since World War 2. Austria is ran by a president and a chancellor now.
The family of Habsburg ruled Austria for nearly 650 years, from a modest beginning as dukes protecting the border of Germany, they became emperors of Austria and of the Holy Roman Empire of the German Nation.
High German was the official language of the Austrian Empire as early as the 1300s and remained the official language of Austria continuously since then, including during the reign of the Habsburgs.
Yes, after the assassination of the Habsburg heir - and Germany encouraged them to take a tough line.
During the Roman Empire, Noricum (most of Austria and Slovenia) was the Roman province of Noricum and Pannonia (eastern Austria and western Hungary) was the Roman province of Pannonia. Later Austria was part of the Carolingian Empire, the Holy Roman Empire, the Habsburg Monarchy, the Austrian Empire and the Austro-Hungarian Empire.