The study analyses the genesis of the accession of the last Arpad Hungarian King – Andrew III. (1290-1301) to the throne and his subsequent military conflict with the Austro-Styrian duke, Albert I. Habsburg. This war resulted from the previous fights between the powerful Hungarian house of Kysek and the Austrian duke, culminating in his occupation of several west Hungarian castles and towns in 1289. Andrew III., as a new sovereign, had to react to this situation and regain the occupied territories. He managed to achieve this following the initial border collisions of spring 1291. After the previous poor and chaotic reign of Ladislaus IV., he was able to gather sufficient military potential to invade Austria in the summer of 1291. By ravaging the border territories, conquering the castles as well as demonstrating his power to Vienna, he finally forced his “powerless” opponent to sign the so called Peace of Hainburg on 26 August 1291. Thereby, he regained the occupied areas in the west of the country and at the same time headed off the Habsburg claims of the Hungarian crown.
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