Josias, Hereditary Prince of Waldeck and Pyrmont was the heir apparent to the throne of the Principality of Waldeck and Pyrmont and a general in the SS. From 1946 until his death, he was the head of the Princely House of Waldeck and Pyrmont. After World War II, he was sentenced to life in prison at the Buchenwald Trial for his part in the "common plan" to violate the Laws and Usages of War in connection with prisoners of war held at Buchenwald concentration camp, but was released after serving about three years in prison.

Buchenwald was a Nazi concentration camp established on Ettersberg hill near Weimar, Germany, in July 1937. It was one of the first and the largest of the concentration camps within Germany's 1937 borders. Many actual or suspected communists were among the first internees.