The founder of the Mevlevi dancing dervishes, the poet Mahommed Jelal-ed-Din (Rumi), in 1307, though tempted to assume the inheritance along with the empire of the Seljuk sultan Ala ed-din Kaikobad III., who died without heirs, preferred to pass on the power to Osman, son of Ertogrul, and with his own hands invested Osman and girt him with the sword: this investiture was the legitimate beginning of the Osmanli authority.
By the concordat of Worms, 1122, the emperor surrendered the right of investiture by ring and staff, and granted the right of election to the clergy.
The firman of investiture issued by the sultan on the occasion.
During the investiture struggle Leopold deserted the emperor Henry IV., who deprived him of Austria and conferred it upon Vratislav II., duke of the Bohemians.
This step was favoured by the pope, and Ottakar, eagerly accepting the offer, strengthened his position by marrying Margaret, a sister of Duke Frederick II., and in return for his investiture promised his assistance to William of Holland.