Austria
The Treaty of Saint-Germain of 1919 (for Hungary the Treaty of Trianon of 1920) confirmed and consolidated the new order of Central Europe which to a great extent had been established in November 1918, creating new states and altering others. The German-speaking parts of Austria which had been part of Austria-Hungary were reduced to a rump state named The Republic of German-Austria (German: "Republik Deutschösterreich"). The desire for "Anschluss" (annexation of Austria to Germany) was a popular opinion shared by all social circles in both Austria and Germany. On 12 November, German-Austria was declared a republic, and named Social Democrat Karl Renner as provisional chancellor. On the same day it drafted a provisional constitution that stated that "German-Austria is a democratic republic" (Article 1) and "German-Austria is an integral part of the German reich" (Article 2). The Treaty of Saint Germain and the Treaty of Versailles explicitly forbid union between Austria and Germany. The treaties also forced German-Austria to rename itself as "Republic of Austria" which consequently led to the first Austrian Republic.
Chancellor of Austria
With the consequent dissolution of the Holy Roman Empire and founding of the Austrian Empire, Francis II abdicated the former Imperial Throne, but remained Emperor Francis I of Austria in 1806. He had replaced Cobenzl with Johan Philip Charles Stadion (1805–1809) the previous year, but his career was in turn cut short in 1809 following yet another Austrian defeat by Napoleon at the Battle of Wagram and subsequent humiliation at the Treaty of Schönbrunn. Prince Klemens von Metternich was appointed by Francis I to the positions of "Hofkanzler" and "Staatskanzler" (1821–1848). However, there is some opinion that the Chancellor title was not used between Prince Kaunitz-Rietberg's resignation in 1792 and 1821. 
As the Metternich system had become a synonym for his reactionary politics, the title of a State Chancellor was abolished upon the 1848 revolutions. The position became that of a Minister-President of Austria, equivalent to Prime Minister, with the exception of Count Friedrich Ferdinand von Beust (1867–1871)
the title only re-emerging at the birth of German Austria after World War I in 1918, when Karl Renner was appointed "Staatskanzler". With the enactment of the Constitution of Austria on 10 November 1920, the actual term "Bundeskanzler" was implemented as head of the executive branch of the First Austrian Republic.