In November 1274, the
Imperial Diet at
Nuremberg decided that all Crown estates seized since the death of the Emperor Frederick II must be restored, and that King Ottokar II must answer to the Diet for not recognising the new king. Ottokar refused to appear or to restore the duchies of
Austria,
Styria and
Carinthia together with the
March of Carniola, which he had claimed through his first wife, a
Babenberg heiress, and which he had seized while disputing them with another Babenberg heir, Margrave
Hermann VI of Baden. Rudolf refused to accept Ottokar's succession to the Babenberg patrimony, declaring that the provinces reverted to the Imperial crown due to the lack of male-line heirs. King Ottokar was placed under the
imperial ban; and in June 1276
war was declared against him. Having persuaded Ottokar's former ally
Duke Henry XIII of Lower Bavaria to switch sides, Rudolf compelled the Bohemian king to cede the four provinces to the control of the royal administration in November 1276. Rudolf then re-invested Ottokar with the
Kingdom of Bohemia, betrothed one of his daughters to Ottokar's son
Wenceslaus II, and made a triumphal entry into
Vienna. Ottokar, however, raised questions about the execution of the treaty, and procured the support of several German princes, again including Henry XIII of Lower Bavaria. To meet this coalition, Rudolf formed an alliance with King
Ladislaus IV of Hungary and gave additional privileges to the Viennese citizens. On 26 August 1278, the rival armies met at the
Battle on the Marchfeld, where Ottokar was defeated and killed. The
Margraviate of Moravia was subdued and its government entrusted to Rudolf's representatives, leaving Ottokar's widow
Kunigunda of Slavonia in control of only the province surrounding Prague, while the young Wenceslaus II was again betrothed to Rudolf's youngest daughter
Judith. Rudolf's attention next turned to the possessions in Austria and the adjacent provinces, which were taken into the royal domain. He spent several years establishing his authority there but found some difficulty in establishing his family as successors to the rule of those provinces. At length, the hostility of the princes was overcome. In December 1282, at the
Hoftag (imperial diet) in
Augsburg, Rudolf invested his sons,
Albert and
Rudolf II, with the duchies of Austria and Styria and so laid the foundation of the House of Habsburg. Additionally, he made the twelve-year-old Rudolf Duke of Swabia, a merely titular dignity, as the duchy had been without an actual ruler since
Conradin's execution. The 27-year-old Duke Albert, married since 1274 to a daughter of Count
Meinhard II of Gorizia-Tyrol (1238–95), was capable enough to hold some sway in the new patrimony. In 1286, King Rudolf fully invested Albert's father-in-law Count Meinhard with the
Duchy of Carinthia, one of the conquered provinces taken from Ottokar. The
Princes of the Empire did not allow Rudolf to give everything that was recovered to the royal domain to his own sons, and his allies needed their rewards too. Turning to the west, in 1281 he compelled Count
Philip I of Savoy to cede some territory to him, then forced the citizens of
Bern to pay the tribute that they had been refusing. After his son
Rudolf II defeated Bern at the
Battle of Schosshalde, he strengthened his authority in Switzerland. He further expanded his Swiss possessions and granted some ecclesiastical posts to his family. In 1289 he marched against Count Philip's successor,
Otto IV, compelling him to do homage. In 1281, Rudolf's first wife died. On 5 February 1284, he married
Isabella, daughter of Duke
Hugh IV of Burgundy, the Empire's western neighbor in the
Kingdom of France. Rudolf was not very successful in restoring internal peace. Orders were indeed issued for the establishment of
territorial peaces in
Bavaria,
Franconia and Swabia, and at the
Synod of Würzburg in March 1287 for the whole Empire. But the king lacked the power, resources, and determination to enforce them, although in December 1289 he led an expedition into
Thuringia, where he destroyed a number of
robber castles. In 1291, he attempted to secure the election of his son Albert as German king. The electors refused, however, claiming inability to support two kings, but in reality, perhaps, wary of the increasing power of the House of Habsburg. Upon Rudolf's death they elected Count
Adolf of Nassau. == Persecution of the Jews ==