Ottokar II of Bohemia

Ottokar II (Czech: Přemysl Otakar II.; c. 1233, in Městec Králové, Bohemia – 26 August 1278, in Dürnkrut, Lower Austria), the Iron and Golden King, was a member of the Přemyslid dynasty who reigned as King of Bohemia from 1253 until his death in 1278. He also held the titles of Margrave of Moravia from 1247, Duke of Austria from 1251, and Duke of Styria from 1260, as well as Duke of Carinthia and landgrave of Carniola from 1269.

With Ottokar's rule, the Přemyslids reached the peak of their power in the Holy Roman Empire. His expectations of the imperial crown, however, were never fulfilled.

Ottokar was the second son of King Wenceslaus I of Bohemia (reigned 1230–1253). Through his mother, Kunigunde, daughter of Philip of Swabia, he was related to the Holy Roman Emperors of the Hohenstaufen dynasty, which became extinct in the male line upon the execution of King Conradin of Sicily in 1268.

Named after his grandfather King Přemysl Ottokar I, he was originally educated for the role of an ecclesiastical administrator, while his elder brother Vladislaus was designated heir of the Bohemian kingdom. He was possibly educated by the Bohemian chancellor Philip of Spanheim, who would later become a rival for the rule of the Duchy of Carinthia.

When his brother Vladislaus died in 1247, Ottokar suddenly became the heir to the Bohemian throne. According to popular oral tradition, he was profoundly shocked by his brother's death and did not involve himself in politics, becoming focused on hunting and drinking. His father appointed the new heir as Margrave of Moravia, and Ottokar took up residence in Brno, where he was occupied with the reconstruction of the Moravian lands devastated by Mongol raids of 1242.

In 1248, some discontented nobles who supported Emperor Frederick II enticed Ottokar into leading a rebellion against his father King Wenceslaus. During this rebellion he was elected "the younger King" (mladší král) on 31 July 1248 and temporarily expelled his father from Prague Castle. Přemysl Ottokar II held the title of King of Bohemia until November 1249. However, Pope Innocent IV excommunicated Ottokar, whereafter Wenceslaus finally managed to defeat the rebels and imprisoned his son at Přimda Castle.

Father and son eventually reconciled to assist the king's aim of acquiring the neighbouring Duchy of Austria. The last Babenberg duke, Frederick II, had been killed in 1246 at the Battle of the Leitha River, sparking the War of the Babenberg Succession. King Wenceslaus had initially attempted to acquire Austria by marrying his heir, Vladislaus, to the last duke's niece Gertrude of Babenberg. That marriage came to an end after half a year with Vladislaus's death in January 1247, and in 1248 Gertrude married the Zähringen margrave Herman VI of Baden. At the death of the last of the Babenberg male line in 1246, Emperor Frederick II seized the duchy as an imperial fief and with it, the sizable Babenberg treasure, installing imperial officials in the Austrian lands and naming his grandson Henry as Duke of Austria and Styria. The Emperor died in late 1250, however, and his grandson was unable to fully establish himself in Austria without his grandfather’s support.

Wenceslaus released Přemysl Ottokar very soon and in 1251 again made him Margrave of Moravia and installed him, with the approval of the Austrian nobles, as governor of Austria. The same year Ottokar entered Austria, where the estates acclaimed him as Duke. To legitimize his position, Přemysl Ottokar married the late Duke Frederick II's sister Margaret of Babenberg, who was his senior by 30 years and the widow of the Hohenstaufen king Henry (VII) of Germany. Their marriage took place on 11 February 1252 at Hainburg.