In 1251 Ottokar 's father King Wenceslaus I of Bohemia had not only granted Giving him the title of a Margrave of Moravia but also installed Placing him as duke of Austria and Styria , territories that were princeless after the ruling Babenberg dynasty Change_of_leadership had become Becoming extinct in 1246 .

To legitimate Legality his succession , Ottokar in 1252 married Forming_relationships the Duchess Margaret of Austria , the sister of the last Babenberg duke and about 26 years his senior .

The quarrels Quarreling were at first settled Resolve_problem with the aid Assistance of Pope Innocent IV in 1254 , when Béla received Receiving large parts of Styria and later installed Change_of_leadership his son Stephen as a duke .

at the battle Attack of unk , navarre defeated Conquering the royal army led by joyeuse ; the duke himself was slain Killing at the battle Hostile_encounter .

In the normal course of affairs this would have cost Cost him his life , but the duke was popular with the masses .

it followed and capitalized on the february revolution Social_event of the same year , which overthrew Change_of_leadership the tsarist autocracy and resulted in Causation a provisional government after a transfer Giving of power proclaimed Statement by grand duke michael , the younger brother of tsar nicholas ii , who declined Agree_or_refuse_to_act to take power after the tsar stepped down .

In the hereditary dynastic lands , such as those governed Control by a prince or a duke , the principle of `` '' ( Latin : whose land , his religion ) provided Supply that the religion of the people would be the same as that of the territorial ruler .