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After Austria was detached from Bavaria and established as an Imperial estate in 1156, the Babenberg dukes also acquired the neighbouring Duchy of Styria in 1192. After the extinction of the line in 1246 and the occupation by King Ottokar II of Bohemia, it was seized by the Habsburg king Rudolf I of Germany, who defeated Ottokar in the 1278 Battle on the Marchfeld and enfeoffed his son Albert I.