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When in 976 his son Emperor Otto II raised the vast Bavarian March of Carinthia to a duchy, the remaining marcha orientalis along the Danube emerged as the March of Austria (Ostarrîchi).
Engelbert attended the 1156 Imperial Diet in Regensburg, where he witnessed the granting of the Privilegium Minus by Emperor Frederick Barbarossa, elevating the March of Austria to a duchy.
Hardegg Castle in the March of Austria was first mentioned in an 1145 deed, it was acquired by the Counts of Plain about 1187.