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 .

As neither side was ready for a full-scale war , Wenceslaus IV of Bohemia brokered Resolve_problem a nine-month truce .