The so-called Golden Bull of Sicily
was a decree issued by the Roman
king and emperor Frederick II
on 26 September 1212
that certified hereditary royal title for Otakar I of Bohemia
and his successors and determined the rights and the duties of the Bohemian monarchs (the Kings of Bohemia
). By this act Frederick II also declared that he and the Empire will give the investiture for Bohemia only to a ruler approved by the people of the country.