Paul was born in St. Petersburg during a period when his father, not yet the ruler of Württemberg, was made governor of Old Finland by Catherine the Great in Russia. The couple had traveled to Russia to visit Frederick's sister Sophie, who was married to the heir to the Russian throne, the Tsesarevich Paul. Prince Paul's parents separated shortly after his birth. The marriage was unhappy, and there were allegations of abusive treatment of his mother. His mother was granted asylum by Catherine the Great and never returned to Württemberg. She died in exile in Koluvere, Estonia, in 1788. In 1797, Frederick married Charlotte, Princess Royal, eldest daughter of King George III of the United Kingdom, who supervised the education of Paul and his two surviving siblings, Wilhelm and Catharina. Charlotte regarded Paul as "a very comical boy and, in my partial eyes, his manners are like Adolphus ." As Paul grew up, her opinion changed. During the visit of the Allied sovereigns to London in 1814, Paul, along with many other princes, was taken to visit the Ascot races by the Prince Regent. He behaved badly and got the Prince of Orange blind drunk. "For thirteen years he has done nothing but offend his father with the improprieties of his conduct", his stepmother wrote.
Shortly before his marriage, Paul had a mistress, an actress named Friederike Margrethe Porth. Friederike was the daughter of Johann Carl Porth and his wife, Caroline. Paul and Friederike had a daughter baptized Adelheid Pauline Karoline, usually called Karoline, marrying later as Karoline von Rottenburg. On 16 February 1836, in Augsburg, Karoline married Freiherr Karl von Pfeffel. The couple are the great-great-grandparents of British Prime Minister Boris Johnson.
Later life and second marriage
In 1815 Paul moved from his home in Stuttgart to Paris, leaving his wife and two sons, but taking his daughters with him. There he led a relatively modest life, but was frequently in the company of intellectuals such as Georges Cuvier. Paul's family did not approve of this and ordered him to return to Württemberg, but he refused. While in Paris, he fathered two more illegitimate daughters by two different mistresses. Shortly after the death of his wife in 1847, Paul went to England with his long-term mistress Magdalena Fausta Angela de Creus y Ximenes or Madeleine Creux, the widow of Sir Sandford Whittingham KCB, and they were married in the Parish Church of St Nicholas, Brighton, Sussex, on 26 April 1848. She died in Paris, 27 December 1852. Their daughter Pauline Madeleine Ximenes, who had been born in Paris on 3 March 1825, was created Countess von Helfenstein in 1841. So far it has not been disclosed who had conferred upon her the aristocratic title of "von Rottenburg". Pauline married Count Gustave de Monttessuy in Paris on 24 August 1843 and died in Paris on 24 February 1905. Paul died in Paris aged 67 on 16 April 1852.