聖イシュトヴァーンの王冠
In need of financial resources to continue the war against Vladislaus, Queen Elizabeth signed a treaty with Frederick III, King of the Romans, in Wiener Neustadt on 22 November. She not only mortgaged Sopron to Frederick III, but also appointed him as her son's guardian and gave the Holy Crown of Hungary to him. Thereafter Ladislaus lived in Frederick III's court, mainly in Wiener Neustatdt.