The Free State of Bohemia [Czech: Svobodný stát Čech] is one of the original nine constituent states of the Danubian Federation. During 1198, the Kingdom of Bohemia was formally established by King Ottokar I. After this, the country became a part of the Habsburg Empire. In 1204 Ottokar's royal dignity was accepted by Otto IV himself as well as by Pope Innocent III. Afterwards it was confirmed by the Golden Bull of Sicily issued by Emperor Frederick II in 1212, promoting the Duchy of Bohemia to Kingdom status and exempting the Czech king from all future obligations to the Holy Roman Empire except for participation in the imperial councils.