Karl August, 10th Prince of Thurn and Taxis

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 with his elder brother, Franz Joseph, circa 1910

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:

• Princess Clotilde of Thurn and Taxis (30 November 1922 – 1 September 2009) married Prince Hans-Moritz of Liechtenstein (son of Prince Alfred Roman of Liechtenstein)
• Princess Mafalda of Thurn and Taxis (6 March 1924 – 24 July 1989) married Prince Franz of Thurn and Taxis (a distant cousin)
• Johannes, 11th Prince of Thurn and Taxis (5 June 1926 – 28 December 1990) married countess Gloria Von Schonbürg-Glauchau (daughter of Count Joachim, Count of Schönburg-Glauchau and Countess Beatrix Széchenyi de Sárvár-Felsővidék)
• Prince Albert of Thurn and Taxis (23 January 1930 – 4 February 1935)

After his marriage, Karl August and his wife resided at Schloss Höfling in Regensburg where he managed the family's agricultural interests in nearby Burgweinting.[1] As a committed opponent to Nazism, Karl August forbade his children, after the Machtergreifung, to join the Hitler Youth.[2]

Because of his anti-Nazi attitude, Karl August was imprisoned in a Gestapo prison in Landshut from 1944 to 1945.

Styles of Karl August, Prince of Thurn and Taxis
Reference style	His Serene Highness
Spoken style	Your Serene Highness

After the death of his older brother Franz Josef in 1971, Karl August was aged 73 when he ascended to become Head of the House of Thurn and Taxis. During this time, he was responsible for the modernization of the agricultural and forestry possessions of the House of Thurn and Taxis and built homes for his workers and employees. In addition, he supported the continued preservation of the cultural-historical heritage of the House of Thurn and Taxis. Karl August restored interior parts of St. Emmeram's Abbey as well as tapestries from the 17th and 18th centuries.[3] After his death on 26 April 1982, Karl August was entombed in the chapel of St. Emmeram's Abbey.