The Austrian Empire (German: Kaisertum Österreich) was a modern era successor empire founded on a remnant of the Holy Roman Empire centered on what is today's Austria that officially lasted from 1804 to 1867. It was followed by the Empire of Austria–Hungary, which was proclaimed after declaring the Emperor of Austria also King of Hungary, a diplomatic move that elevated Hungary's status within the Austrian Empire as a result of the Austro-Hungarian Compromise of 1867. The Austro-Hungarian Empire (1867 to 1918) was itself dissolved by the victors at the end of World War I and broken into separate new states.
The term "Austrian Empire" is also used for the Habsburg possessions before 1804, which had no official collective name, although Austria is more frequent; the term of Austria–Hungary has also been used.
The Austrian Empire was founded by the Habsburg monarch Holy Roman Emperor Francis II (who became Emperor Francis I of Austria), as a state comprising his personal lands within and outside of the Holy Roman Empire.
This was a reaction to Napoleon Bonaparte's proclamation of the First French Empire in 1804.
Austria and some parts of the Holy Roman Empire then took the field against France and its German allies during the Third Coalition which led to the crushing defeat at Austerlitz in early December 1805. By the fourth of that same month, a cease fire was in place and peace talks were being conducted nearby.