Margraviate of Austria

The Margraviate of Austria was a medieval frontier march, centered along the river Danube, between the river Enns and the Vienna Woods, within the territory of modern Austrian provinces of Upper Austria and Lower Austria. It existed from c. 972 to 1156.
It stemmed from the previous frontier structures, initially created for the defense of eastern Bavarian borders against the Avars, who were defeated and conquered during the reign of Charlemagne . Throughout the Frankish period, the region was under jurisdiction of Eastern Frankish rulers, who held Bavaria and appointed frontier commanders in eastern regions.

Wikipedia