After marriage, the Prince lived with his wife in
Rudy. In 1912, was elected
Landrat of Frankenstein District, where it remained until 1918, until the
abolition of the
German monarchy and the establishment of the
Weimar Republic. Previously, he participated actively in hostilities during the
First World War, for which he was promoted to the rank of
major general. Much of the time he traveled through Europe and the world, sometimes in important diplomatic missions, representing
Emperor Wilhelm II. Sensing the fall of the monarchy in Germany, at the end of the war, he took up for discussion and exchange views with university professors on the reconstruction of the existing system of government, proposing the introduction of a
constitutional monarchy modeled on the form of government of the
United Kingdom. In 1918, he was considered for the office of the
King of Finland. However, his wife's Catholicism prevented this, and the Finns chose
Prince Frederick Charles of Hesse (who was Lutheran as was his wife) instead. After the war and the establishment of the republic in Germany, Friedrich Wilhelm became involved with the
monarchists, proposing the restoration of the German Empire. He was determined to take over the role of regent until the
heir to the throne reached the age of maturity. He died in 1925, aged 44 in Weisser Hirsch, a residential district in
Dresden. ==Marriage and issue==