The first written reference to a settlement named "Brezalauspurc" dates to 907 and is related to the Battle of Pressburg, during which a Bavarian army was defeated by the Hungarians. It is connected to the fall of Great Moravia, already weakened by its own inner decline and under the attacks of the Hungarians. The exact location of the battle remains unknown, and some interpretations place it west of Lake Balaton.