رودولف الأول
Ladislaus joined forces with Rudolf I of Germany to launch a campaign against Ottokar II. Ladislaus's troops played a decisive role in Rudolf's victory in the Battle on the Marchfeld on 26 August. Ottokar was killed in the battlefield. After the battle, King Rudolf I gave Ladislaus "his thanks, declaring that through his help all Austria and Styria had been restored to him", according to Ladislaus's chronicler, Simon of Kéza.