Ostmark(redirected from Ostmarch)
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A border province along the central Danube River, established by Charlemagne in the early ninth century after the defeat of the Avars. In the early tenth century, the Hungarians conquered it, and in the second half of the tenth century, after the defeat of the Hungarians (955), the new so-called Bavarian Ostmark was established. In 976 the Babenbergs became the margraves of the Bavarian Ostmark, and this territory became the historical nucleus of Austria.
(2) The so-called Saxon Ostmark was established in the second half of the tenth century on a part of the lands of the Lusatian Sorbs that had been conquered by German feudal lords. Later it became part of the territory of the German principality of Saxony.