The House of Habsburg-Lorraine was the ruling dynasty of the Holy Roman Empire from 1745 to 1806 and of the Austrian Empire from 1806 to 1918. The house was formed after the union of Francis of Lorraine (from the House of Lorraine) and Maria Theresa of Austria (from the House of Habsburg). The family ruled the core Habsburg dominions of Austria, Hungary, and Bohemia, while junior branches ruled Tuscany until 1860, Parma until 1847, and Modena until 1859. In 1918, the end of World War I and the dissolution of Austria-Hungary led to the House of Habsburg-Lorraine losing power.