Karl Anton, Prince of Hohenzollern

Karl Anton, Prince of Hohenzollern-Sigmaringen was the last reigning prince of Hohenzollern-Sigmaringen before the territory was annexed by the Kingdom of Prussia in 1849. Afterwards, he continued to be titular prince of his house and – with the death of the last prince of Hohenzollern-Hechingen in 1869 – of the entire Swabian branch of the House of Hohenzollern. He served as Minister President of Prussia from 1858 to 1862, the only Hohenzollern prince to hold that post. His second son, Karl, became king of Romania. The offer of the throne of Spain to his eldest son, Leopold, was one of the causes of the Franco-Prussian War, which led to the unification of Germany and the creation of the German Empire.