Charles, Prince of Löwenstein-Wertheim-Rosenberg (1904–1990)

When Löwenstein's behavior during National Socialism came into public discussion in 1967 after his appointment as a member of the World Lay Council, he resigned as President of the Central Committee in the same year. It was the journalist Leo Waltermann who broadcast the Nazi past of Löwenstein in a WDR program had called to memory and made serious accusations. Waltermann had obtained source material that was sent to him by Catholics abroad who did not want to accept a member of the lay council with a Nazi past. The three-generation tradition of the Löwenstein family at the head of the German Catholic Days ended. Karl's son Alois Konstantin builds on this family tradition by serving as a board member of the Forum Deutscher Katholiken since 2001 through the programs of the annual congresses organized by this organization in competition with the central committee "Joy in Faith", which are designed as a conservative alternative event to the Catholic Day.

Karl Erbprinz zu Löwenstein was elected President of the Central Committee of German Catholics on September 6, 1948, one day after the end of the Catholic Day in Mainz. His father Aloysius and his grandfather of the same name Charles of Löwenstein also held this office. The latter was the founder of the ZdK in 1868. This allowed Karl zu Löwenstein to continue a long tradition. This met both the ideas of the church dignitaries and the Allies Occupying Powers. Despite the political statements made by Karl zu Löwenstein in the 1930s, he was able to benefit from the prestige of his name. As President of the Central Committee, he showed unconditional commitment to the Church and the Pope and gained respect in wide circles of post-war West German society during the Adenauer era. Before the Second Vatican Council Löwenstein promoted interdenominational dialogue. Together with the President of the Evangelical Church Day, Reinhold von Thadden-Trieglaff, he organized ecumenical encounters between Catholics and Protestants. Like his father, Löwenstein supported the German missionaries and promoted international cooperation between Christians worldwide.

In Rome in 1935 Karl Erbprinz zu Löwenstein-Wertheim-Rosenberg married Carolina dei Conti Rignon (1904–1975), with whom he had seven children:

During the time of the Weimar Republic, Löwenstein joined various organizations that were active in the environment of the right-wing extremist Hugenberg Press. In particular, he appeared as a leading member of the Berlin National Club. At the Catholic Day in Nuremberg in 1931, he confessed his admiration for some aspects of the politics of the Fascist regime in Italy. In his opinion, the "shamelessness" in the German press, art, theater and film industry went far too far. The values of the Catholic Church were more important to Löwenstein than parliamentary democracy. Mussolini's Italy appeared to Löwenstein in 1931 as the better alternative, also with a view to an official leadership role of the aristocracy that was once again possible in a civil society. By contrast, Löwenstein criticized the extreme excesses of the Nazi ideology in 1931, especially its race theory. During the Nazi era, however, Löwenstein was a member of the SA and in 1934 asked the Unitas students to follow his example. In 1937 Karl zu Löwenstein denounced his liberal cousin Hubertus Prinz zu Löwenstein-Wertheim-Freudenberg, who denounced the Nazi persecution of Catholics on a trip through America. After 1945, Karl zu Löwenstein dismissed this as a necessary tribute to the time of National Socialism.

Karl, Prince of Löwenstein-Wertheim-Rosenberg (German: Karl Friedrich Fürst zu Löwenstein-Wertheim-Rosenberg; 8 February 1904 in Kleinheubach – 23 August 1990 in Kleinheubach) was a German Roman Catholic nobleman. From 1948 to 1967 he was president of the Central Committee of German Catholics. Born as Prinz zu Löwenstein-Wertheim-Rosenberg, he inherited the title of 'Erbrpinz' on his father's accession in 1921 and became Fürst zu Löwenstein-Wertheim-Rosenberg on his father's death in 1952.