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6 ore fa · His grandson Radbot of Klettgau founded the Habsburg Castle. That castle was the family seat during most of the 11th, 12th and 13th centuries. Giovanni Thomas Marnavich in his book " Regiae Sanctitatis Illyricanae Faecunditas " dedicated to Ferdinand III , wrote that the House of Habsburg is descended from the Roman emperor Constantine the Great , [11] an invention common in ruling dynasties ...
