History of Austria
Austria was dominated by the House of Habsburg and House of Habsburg-Lorraine ("Haus Österreich") from 1273 to 1918. In 1808, when Emperor Francis II of Austria dissolved the Holy Roman Empire, Austria became the Austrian Empire, and was also part of the German Confederation until the Austro-Prussian War of 1866. In 1867, Austria formed a dual monarchy with Hungary: the Austro-Hungarian Empire (1867–1918). When this empire collapsed after the end of World War I in 1918, Austria was reduced to the main, mostly German-speaking areas of the empire (its current frontiers), and adopted the name The Republic of German-Austria. However the union and name were forbidden by the Allies at the Treaty of Versailles. This led to the creation of the First Austrian Republic (1918-1933).
Karl Seitz
Seitz entered history in 1918, when Austria-Hungary was breaking down, and its disintegration into smaller independent nation states was becoming manifest. On October 21, the Imperial Council members representing the empire's ethnically-German provinces moved to form a Provisional National Assembly for their paralyzed rump state. In its constituent session, the Provisional National Assembly appointed Seitz as one of its three chairmen. Barely more than a week later, by October 30, Seitz had informally emerged as an acting head of state. By November 12, Emperor Karl had abdicated, and the Republic of German Austria had been proclaimed. Seitz had thus turned from acting head of state to provisional president.