Béla and Daniil Romanovich united their troops and invaded Austria and Moravia in June 1252. After their withdrawal, Ottokar, Margrave of Moravia—who had married Margaret of Austria—invaded and occupied Austria and Styria. In the summer of 1253, Béla launched a campaign against Moravia and laid siege to Olomouc. Daniil Romanovich, Boleslaw the Chaste of Cracow, and Wladislaw of Opole intervened on Béla's behalf, but he lifted the siege by the end of June. Pope Innocent IV mediated a peace treaty, which was signed in Pressburg (Bratislava, Slovakia) on 1 May 1254. In accordance with the treaty, Ottokar, who had in the meantime become King of Bohemia, ceded Styria to Béla.