Austria under National Socialism lost its original, republican system of government and was administered by "Reichsstatthalter" Arthur Seyss-Inquart (1938–1939), Reich Commissioner Josef Bürckel (1939–1940) and "Reichsstatthalter" Baldur von Schirach (1940–1945). In 1940, the country was renamed Ostmark, completely lost its autonomy and became an administrative division of Nazi Germany. After the liberation of Vienna and the dissolution of Nazi Germany, Austria reinstated its republican form of government. However, the country remained under allied occupation until 1955 and thus the country's ultimate sovereignty was still held by the Allied Control Council.