After the Anschluss ("union") with Germany, Austria , renamed Ostmark, became the first of a new type of administrative subdivision called a Reichsgau (not to be confused with Nazi Party Gaue). Austria's last pre-war chancellor Arthur Seyss-Inquart became its first Reichsstatthalter. However, with the promulgation of the Ostmarkgesetz on 1 May 1939, the former States of Austria were reorganized into seven new Reichsgaue, each under the rule of a government official holding the dual offices of Reichsstatthalter (governor) and Gauleiter (Nazi Party leader).