The Golden Bull of Sicily (Czech: Zlatá bula sicilská; Latin: Bulla Aurea Siciliæ) was a decree issued by the King of Sicily and future Emperor Frederick II in Basel on 26 September 1212 that confirmed the royal title obtained by Ottokar I of Bohemia in 1198, declaring him and his heirs kings of Bohemia. The kingship signified the exceptional status of Bohemia within the Holy Roman Empire.
Ottokar's Přemyslid ancestor Vratislaus II had already been elevated to kingship by Emperor Henry IV in 1085 at the diet in Mainz. He was crowned at Prague by Archbishop Egilbert of Trier the next year, the title however was not hereditary and upon his death in 1092, his brother Conrad I succeeded him again as duke. In 1158 Vratislaus' grandson Vladislaus II achieved kingship again, bestowed by Emperor Frederick Barbarossa, whom he had accompanied on his Italian campaign against Milan, but failed to secure the succession of his eldest son Frederick.
