Maria Theresa was ruler of the Habsburg dominions from 1740 until her death in 1780, and the only woman to hold the position suo jure. She was the sovereign of Austria, Hungary, Croatia, Bohemia, Transylvania, Mantua, Milan, Galicia and Lodomeria, the Austrian Netherlands, and Parma. By marriage, she was Duchess of Lorraine, Grand Duchess of Tuscany, and Holy Roman Empress.

The Habsburg monarchy, also known as Habsburg Empire, or Habsburg Realm, was the collection of empires, kingdoms, duchies, counties and other polities that were ruled by the House of Habsburg. From the 18th century it is also referred to as the Danubian monarchy or the Austrian monarchy.