on the Danube River, the ancestral home of the princes of Sigmaringen-Hohenzollern After leaving the Prussian government, Karl Anton largely resigned from active politics and focused on his role as head of the Catholic branch of the Hohenzollern family, a position that was accentuated by the extinction of the
Hohenzollern-Hechingen line in 1869. In 1866 his son
Karl was elected Prince of Romania. When in February 1870 his other son
Leopold was offered the Spanish throne, German Chancellor
Otto von Bismarck urged Karl Anton to accept the offer, which he did after a period of hesitation. In view of his kinship with the French houses of Murat and Bonaparte, the approval of the French emperor
Napoleon III seemed possible. When the candidacy threatened to ignite a European crisis, Karl Anton withdrew his son's name on 12 July 1870, but it was not enough to prevent the
Franco-Prussian War of 1870/71. The
Ems Dispatch, which incited France to declare war on Prussia, was issued one day later. During the war, Karl Anton did not hold a frontline command. He was military governor of the
Rhine Province and the
Province of Westphalia, with the rank of commanding general. In 1871 Sigmaringen again became Karl Anton's permanent residence. He and his wife celebrated their golden wedding anniversary in 1884 with a thirteen-course meal. The prince was an avid hunter and a collector of art, books and guns, as well as an enthusiastic amateur antiquarian who offered guided tours of his collections and art treasures in
Sigmaringen Castle. He spent the last years of his life burdened by a paralysis of the legs. Karl Anton died on 2 June 1885. ==Honors==