"Adolf IV (before 1205 – 8 July 1261), was a Count of Schauenburg (1225–1238) and of Holstein (1227–1238), of the House of Schaumburg. Adolf was the ...
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eldest son of Adolf III of Schauenburg and Holstein by his second wife, Adelheid of Querfurt." - (en.wikipedia.org 16.10.2020)
