Karl Alexander, 5th Prince of Thurn and Taxis

Karl Alexander studied at the Universities of Strasbourg, Würzburg, and Mainz and then subsequently went on a European tour. In 1797, he was appointed successor to his ailing father's position as Prinzipalkommissar at the Perpetual Imperial Diet in Regensburg. Karl Alexander also worked for the Thurn and Taxis postal empire, operating during a decline due to the gradual loss of territory as a result of the Napoleonic Wars.

Karl Alexander married Duchess Therese of Mecklenburg-Strelitz, fourth eldest child and third eldest daughter of Charles II, Grand Duke of Mecklenburg and his wife Princess Friederike of Hesse-Darmstadt, on 25 May 1789 in Neustrelitz, Mecklenburg-Strelitz. Karl Alexander and Therese had seven children:

• Princess Charlotte Luise of Thurn and Taxis (24 March 1790 – 22 October 1790)
• Prince George Karl of Thurn and Taxis (26 March 1792 – 20 January 1795)
• Princess Maria Theresia of Thurn and Taxis (6 July 1794 – 18 August 1874), ancestress of Gloria, Princess of Thurn and Taxis
• Princess Luise Friederike of Thurn and Taxis (29 August 1798 – 1 December 1798)
• Princess Maria Sophia Dorothea of Thurn and Taxis (4 March 1800 – 20 December 1870)
• Maximilian Karl, 6th Prince of Thurn and Taxis (3 November 1802 – 10 November 1871)
• Prince Friedrich Wilhelm of Thurn and Taxis (29 January 1805 – 7 September 1825)

Karl Alexander, 5th Prince of Thurn and Taxis

After the end of the Holy Roman Empire, the Thurn and Taxis postal system continued to survive as a private company. Since 1806, Karl Alexander headed a private postal company, the Thurn-und-Taxis-Post. It existed first as a feud of some of the Confederation of the Rhine members, such as Baden, Bavaria, and Württemberg. Bavaria, however, nationalized the postal system two years later. After the Congress of Vienna, Karl Alexander took over the Hessian and Thuringian postal services, as well as those in the Hanseatic League cities of Bremen, Hamburg, and Lübeck, and Schaffhausen. From 1820, the company began to prosper again, so Karl Alexander began to acquire large amounts of land holdings.

According to the Confederation of the Rhine Act, agreed upon between Napoleon I of France and the Confederation of the Rhine princes, the Principality of Thurn and Taxis lost its independence and was mediatised in 1806. Since then, the Princes of Thurn and Taxis and hence Karl Alexander, depending on the territory, were subjects of either the King of Württemberg, or the Princes of Hohenzollern-Sigmaringen. In return, the House of Thurn and Taxis received the Imperial Abbey of St. Emmeram and associated territories in Regensburg. Karl Alexander also received as the family head of the House of Thurn and Taxis, Prussian possessions in the Grand Duchy of Poland. In 1822/23, he bought from the Count Kinsky and others the Burg Richenburg in Bohemia.

• Wolfgang Behringer: Thurn und Taxis, München 1990 ISBN 3-492-03336-9
• Wolfgang Behringer: Im Zeichen des Merkur, Göttingen 2003 ISBN 3-525-35187-9
• Wolfgang Behringer: Innovative Reichsfürsten, in: Damals, Juli 2005
• Martin Dallmeier: Quellen zur Geschichte des europäischen Postwesens, Lassleben, Kallmünz 1977
• Ludwig Kalmus: Weltgeschichte der Post, Wien 1937
• Max Piendl: Das fürstliche Haus Thurn und Taxis, Regensburg 1980
• Europäische Stammtafeln Band V, Genealogie Thurn und Taxis, Tafel 131
• Eugen Lennhoff/Oskar Posner: Internationales Freimaurer-Lexikon. Wien 1932, Nachdruck: Almathea-Verlag München 1980

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