Karl August Bleibtreu was a German writer who promoted naturalism in German literature. He was noted for his aggressive and dogmatic style of criticism, linked to a nationalistic and sometimes antisemitic agenda. His later work was heavily influenced by Nietzsche's theory of the übermensch.
Karl Bosl was a German regional historian. He held the chair for Bavarian regional history at the Ludwig Maximilian University of Munich from 1960 until his retirement in 1977.
Karl Christian Friedrich Krause was a German philosopher whose doctrines became known as Krausism. Krausism, when considered in its totality as a complete, stand-alone philosophical system, had only a small following in Germany, France, and Belgium, in contradistinction to certain other philosophical systems that had a much larger following in Europe at that time. However, Krausism became very popular and influential in Restoration Spain not as a complete, comprehensive philosophical system per se, but as a broad cultural movement. In Spain, Krausism was known as "Krausismo", and Krausists were known as "Krausistas". Outside of Spain, the Spanish Krausist cultural movement was referred to as Spanish Krausism.
