Karl August Joseph Maria Maximilian Lamoral Antonius Ignatius Benediktus Valentin, 10th Prince of Thurn and Taxis (full German name: Karl August Joseph Maria Maximilian Lamoral Antonius Ignatius Benediktus Valentin Fürst von Thurn und Taxis; 23 July 1898, Schloss Garatshausen, Feldafing, Kingdom of Bavaria – 26 April 1982, Regensburg, Bavaria, Germany) was the tenth Prince of Thurn and Taxis and Head of the Princely House of Thurn and Taxis from 13 July 1971 until his death on 26 April 1982.

Karl August was the third son and child of Albert, 8th Prince of Thurn and Taxis, and his wife, Archduchess Margarethe Klementine of Austria. After graduating from a local high school, Karl August studied science at the University of Würzburg.

Karl August married Princess Maria Anna of Braganza, daughter of Miguel, Duke of Braganza, and his wife Princess Maria Theresa of Löwenstein-Wertheim-Rosenberg, on 18 August 1921 at Schloss Taxis in Dischingen, Baden-Württemberg, Germany. Karl August and Maria Ana had four children:

After his marriage, Karl August and his wife resided at Gut Höfling in Regensburg where he managed the family's agricultural interests in nearby Burgweinting. As a committed opponent to Nazism, Karl August forbade his children, after the Machtergreifung, to join the Hitler Youth.

...
Wikipedia