of Count Rudolf of Habsburg, who was elected King of the Romans in 1273 and stuck in a fierce conflict with the mighty king Ottokar II of Bohemia around several "alienated" Imperial territories, which Ottokar had acquired during the preceding interregnum. In 1276 Meinhard married his daughter Elisabeth off to Rudolf's eldest son Albert. Meinhard backed Rudolf's campaign against Ottokar and in turn received Carinthia with the Carniolan march as a pledge in 1276. After Ottokar's defeat in the 1278 Battle on the Marchfeld, King Rudolf formally elevated Meinhard to a Prince of the Holy Roman Empire and finally vested him with the Duchy of Carinthia as a fief at the Imperial Diet of Augsburg in 1286. On September 1, Meinhard was enthroned at the Duke's Chair and thus became the first Carinthian duke of the Gorizia-Tyrol dynasty. In 1286–9 Meinhard issued a vernacular Tyrolean Landrecht, albeit only fragmentarily transmitted upon today. As far as can be ascertained, he had no ancestry in earlier Carinthian ducal families, whereas he was a distant descendant of some early Meranian lords of Istria and Carniola. His investiture of the duchy included a provision that in extinction of his male line, the House of Habsburg would be its heir. This materialized in 1335 upon the death of his son Henry. The Habsburgs also acquired the County of Tyrol from Henry's daughter Margaret in 1363. Meinhard died in 1295 at Greifenburg in Carinthia. His younger son Henry succeeded him as Carinthian duke and in 1307 was even elected King of Bohemia; his eldest daughter Elisabeth by her marriage with Albert of Habsburg became German queen in 1298. Marriage and children Meinhard's wife from 1258 was Elisabeth of Wittelsbach (c. 1227–73), the daughter of Duke Otto II of Bavaria and widow of King Conrad IV of Germany. Thus he was the stepfather of Conradin of Hohenstaufen, Duke of Swabia and claimant of the Kingdom of Sicily, who was executed in 1268. With Elisabeth he had the following children: Elisabeth (1262–1312), married Albert of Habsburg, Duke of Austria and Styria from 1282, King of Germany from 1298 Otto III (c. 1265–1310), Duke of Carinthia and Count of Tyrol, married Euphemia (c. 1278–1347), daughter of the Piast duke Henry V of Legnica Albert II, Count of Tyrol, died 1292, married Agnes of Hohenberg in 1281, daughter of Albert II of Hohenberg-Rotenburg (c. 1235–98), Count of Hohenberg and Haigerloch,