After studying forestry and economics, he served with the 5th Reserve Mountain Battalion during World War I and retired from military service in 1919 with the rank of oberst. He then managed the Hohenzollern estate in Umkirch near Freiburg im Breisgau until his father's death in 1927. During the 1920s he was engaged in a dispute with the SPD Government over the use of his princely title and royal surname. The District President of the province of Hohenzollern, Alfons Scherer, informed the authorities in a circular dated July 9, 1928 that after the death of his father, Frederick had no right to either the predicate Highness nor the title Prince of Hohenzollern, arguing that the title had expired in 1927 with the death of Wilhelm Prince of Hohenzollern. This was resolved when Frederick threatened the city of Sigmaringen with moving his administration to Munich, prompting Minister of the Interior Carl Severing to put Scherer on leave.
Despite the adverse conditions during the global economic crisis of the early 1930s, Frederick managed to secure ownership of the family properties and its businesses, especially the extensive forest holdings in East Germany. He managed to buy back part of the art treasures that his father had already sold and thus save the Hohenzollern art collection.
Frederick was honorary chairman of the Silesian Maltese Knights of Law and head of the Stahlhelm in Württemberg and Baden. His affinity for cultivating military traditions led to a rapprochement with the Nazis. His younger twin brother joined the SS and in 1935 the Nazi state awarded Frederick the title of Royal Highness. He was however forbidden to serve in the German military because of Hitler's 1940 Prinzenerlass decree. From the early 1930s he served as Prince-Grand Prior of the Order of Saint Lazarus in Germany.[1]
Marriage and children
Frederick, Prince of Hohenzollern with his wife Princess Margarethe Karola of Saxony, 1920s.
Frederick and Margarete Karola had seven children:
Princess Benedikta Maria Antonia Mathilde Anna of Hohenzollern (born 19 February 1921 in Sigmaringen; died 11 October 2011 in Sigmaringen), married Heinrich Maria, Count von Waldburg zu Wolfegg und Waldsee (born 16 September 1911 in Wolfegg; died 25 May 1972 in Stuttgart) on 4 January 1942, and had ten children (seven daughters and three sons)
Princess Maria Theresia Ludovika Cecilie Zita Elisabeth Hilda Agnes of Hohenzollern (born 11 October 1922 at Schloss Sigmaringen; died 13 December 2004)
In 1948, soon after the deposition of king Michael of Romania the line of succession was discussed during a meeting between Michael, his uncle Prince Nicholas of Romania, and Prince Frederick. Shortly after this meeting, the spokesman of King Carol II, in an interview with the French paper Le Figaro, expressed his strong support for Prince Frederick, additionally asserting that Michael would never regain the throne.[2]