Ottokar I of Bohemia
Duke Ottokar I of Bohemia gained the hereditary royal title to the Duchy of Bohemia in 1198, from the German (anti)−king Philip of Swabia, for his support. Along with the title, Philip also raised the duchy to the Kingdom of Bohemia rank. The regality was ultimately confirmed by Philip's nephew the German king Frederick II, later the Holy Roman Emperor (1220−1250), in the Golden Bull of Sicily issued in 1212.