http://genealogy.euweb.cz/thurn/thurn5.html#MTKA

KARL ANSELM Fürst von Thurn und Taxis, etc, *Frankfurt 2.6.1733, +Winzer bei Regensburg 13.11.1805; 1m: 3.9.1753 (div 1776) Dss Auguste von Württemberg (*30.10.1734 +4.6.1787); 2m: (morganatically) 1787 Elisabeth Hildebrand, cr Frau von Train by the Elector Palatine 29.7.1788; He had issue:

• A1. Maria Theresia, *Regensburg 10.7.1757, +Wallerstein 9.3.1776; m.Schloß Trugenhofen 25.8.1774 Fst Kraft Ernst zu Oettingen-Oettingen und Oettingen-Wallerstein (*3.8.1748 +6.10.1802)
• A2. Sophie Friederike Dorothea Henriette, *Regensburg 20.7.1758, +31.5.1800; 1m: Regensburg 31.12.1775 Pr Hieronymus Vincenz Radziwill (+18.9.1786); 2m: ca 1795 N Kazanowski; 3m: ca 1797 Ct N Ostrorog
• A3. Franz Johann Nepomuck, bap Regensburg 2.10.1759, +Regensburg 22.1.1760
• A4. Henrica Karoline, bap Regensburg 25.4.1762, +25.4.1784; m.Regensburg 21.4.1783 Fst Johann Alois II zu Oettingen-Oettingen und Oettingen-Spielberg (*16.4.1758 +27.6.1797)
• A5. Alexander Karl, *Regensburg 19.4.1763, +Regensburg 21.4.1763
• A6. Friederike Dorothea, bap Regensburg 11.9.1764, +Regensburg 10.11.1764
• A7. KARL ALEXANDER, Fürst von Thurn und Taxis, bap Regensburg 22.2.1770, +Schloß Taxis 15.7.1827; m.Neustrelitz 25.5.1789 Herzogin Therese Mathilde von Mecklenburg (*Hannover 5.4.1773, +Schloß Taxis 12.2.1839)
  • B1. Charlotte Luise, *Regensburg 24.3.1790, +Regensburg 22.10.1790
  • B2. Georg Karl, *Regensburg 26.3.1792, +Regensburg 20.1.1795
  • B3. Maria Theresia, *Regensburg 6.7.1794, +Hüttelsdorf 18.8.1874; m.Regensburg 18.6.1812 Fst Pál Antal Esterházy von Galántha (*10.3.1786 +21.5.1866)
  • B4. Luise Friederike, *Regensburg 29.8.1798, +Regensburg 1.12.1798
  • B5. Maria Sophia Dorothea, *Regensburg 4.3.1800, +Regensburg 20.12.1870; m.Schloß Taxis 17.4.1827 (div 1835) Duke Friedrich of Württemberg (*Karlsruhe 25.6.1797, +Mergentheim 25.11.1860)
  • B6. MAXIMILIAN Karl, Fürst von Thurn und Taxis, etc, *Regensburg 3.11.1802, +Regensburg 10.11.1871; 1m: Regensburg 24.8.1828 Wilhelmine, Frn von Dörnberg (*Ansbach 6.3.1803, +Nürnberg 14.5.1835); 2m: Oettingen 24.1.1839 Pss Mathilde Sophie zu Oettingen-Oettingen und Oettingen-Spielberg (*9.2.1816 +20.1.1886)
    • ...
  • B7. Friedrich Wilhelm, *Regensburg 29.1.1805, +Schloß Taxis 7.9.1825
• A8. Friedrich Johann Nepomuck, *Regensburg 11.4.1772, +Stuttgart 7.12.1805
• A9. [2m.] Nikolaus Joseph Karl August Kranz, cr Herr von Train by the King of Bavaria 1.8.1814, *Regensburg 17.5.1788, +Landshut 12.4.1851; m.3.7.1815 Maria Anna Josephine Hyazinthe, Frn von Schönprunn (3.4.1793, +Regensburg 29.3.1855)
  • ...

-------------------- Early life

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 Immerwährender Reichstag (German: 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.

[edit] Marriage and family

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.[1][2] Karl Alexander and Therese had seven children:[1][2]

http://en.wikipedia.org/wiki/Karl_Alexander,_5th_Prince_of_Thurn_and_Taxis