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.
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Bernhard's paternal grandparents were Margrave Engelbert III of Istria and Matilda of Sulzbach.
####Mechtild (d.1245), married to Count Frederick I of Hohenburg, secondly to Count Engelbert III of Görz
After the early death of his elder brother Engelbert III in 1401, he succeeded as Count of Ziegenhain and Nidda.