William of Rosenberg
| William of Rosenberg | |
|---|---|
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| Spouse(s) | Catherine of Brunswick Sophie of Brandenburg Anna Maria of Baden Polyxena of Pernstein |
| Noble family | House of Rosenberg |
| Father | Jošt III of Rosenberg |
| Mother | Anna of Roggendorf |
| Born | 10 March 1535 |
| Died | 1592 |
| Buried | St. Vitus Church in Třeboň |
William of Rosenberg (Czech: Vilém z Rožmberka; 10 March 1535 – 1592), was a Bohemian nobleman. He served as High Treasurer and High Burgrave of Bohemia.
William of Rosenberg was a member of the influential noble House of Rosenberg. He was the son of Jošt III of Rosenberg and his second wife Anna of Roggendorf (d. 1562). His father died when William was four years old. William and his younger brother Peter Vok then stood under the guardianship of their uncle Peter V. From age seven, he studied at the Protestant private school of Arnošt Kraiger von Kraigk in Mlada Boleslav. In 1544, at the age of nine, he switched to a Catholic school for young nobles at the court of Bishop Wolfgang of Passau.
On 23 April 1551, at the age of sixteen, William was declared an adult by a decree of Emperor Ferdinand I. He took up the administration of the family's possessions and chose as his residence Český Krumlov Castle, which he remodeled in a Renaissance style. From 1552 to 1556, he fought a court case against Henry IV of Plauen, the High Chancellor of Bohemia, about their precedence in Bohemian society. William won. In 1560, he was appointed High Treasurer by King Ferdinand. In 1566, he was appointed commander of the Bohemian army and on 10 June 1566, he began forming an army at Znojmo to fight a war against the Ottoman Empire. Their aim was to recapture Szigetvár, which William's brother-in-law Nikola Šubić Zrinski had lost to the Turks. The Habsburg armies were to meet at Győr. However, the Turks retreated south after the death of Suleiman the Magnificent and no battle ensued.
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