of Habsburg in Austria and Central Europe. The influence of the Přemyslid kings of Bohemia was diminished and restricted to their inheritance in Bohemia and Moravia. Background The deposition of Emperor Frederick II of Hohenstaufen by Pope Innocent IV in 1245 created a grave crisis for the Holy Roman Empire, as in the following decades several nobles were elected as Rex Romanorum and Emperor-to-be, none of whom were able to gain actual governing power upon the Emperor's death in 1250. That same year, Ottokar II, son of King Wenceslaus I of Bohemia, moved into the princeless Duchies of Austria and Styria. The last Babenberg duke Frederick II of Austria had been killed at the 1246 Battle of the Leitha River, in a border conflict he had picked with King Béla IV of Hungary. Ottokar II gained the support of the local nobility and was proclaimed Austrian and Styrian duke by the estates one year later. In 1253, Ottokar II became Bohemian king upon the death of his father; the concentration of power on the western Hungarian border was viewed with suspicion by King Béla IV, who campaigned against Austria and Styria but was finally defeated at the 1260 Battle of Kressenbrunn. In 1268 Ottokar signed a contract of inheritance with Ulrich III, the last Carinthian duke of the House of Sponheim, and thus acquired Carinthia including the March of Carniola and the Windic March one year later. At the height of his power he aimed at the Imperial crown, but the Princes-Electors (Kurfürsten), distrustful of his steep rise, elected the "poor Swabian count" Rudolph of Habsburg King of the Romans on 29 September 1273. Prelude As the election had taken place in his absence, Ottokar did not acknowledge Rudolph as King. Rudolph himself had promised to regain the "alienated" territories which had to be conferred by the Imperial power with consent of the Prince-electors. He claimed the Austrian and Carinthian territories for the Empire and summoned Ottokar to the 1275 Reichstag at Würzburg. By not appearing before the Diet, Ottokar set the events of his demise in motion. He was placed under the Imperial ban and had all his territorial rights revoked, including even his Bohemian inheritance. Meanwhile, Rudolph was gathering allies and preparing for battle. He achieved two of these alliances through the classic Habsburg style – marriage. First, he married his son Albert to Elisabeth of Gorizia-Tyrol. In