William I of Württemberg sex or gender male
Firstly on 8 June 1808 in Munich to Caroline Augusta (1792–1873), daughter of King Maximilian I of Bavaria (1756–1825) and Princess Augusta Wilhelmine of Hesse-Darmstadt (1765–1796). They divorced in 1814, without issue;
Secondly on 24 January 1816 in Saint Petersburg, Russia, he married his first cousin Grand Duchess Catherine Pavlovna of Russia (1788–1819), daughter of Emperor Paul I of Russia (1754–1801) and Princess Sophie Dorothea of Württemberg (1759–1828) by whom he had two daughters:
Princess Marie Friederike Charlotte of Württemberg (1816–1887) who married Alfred, Count von Neipperg (1807–1865);
Princess Sophie of Württemberg (1818–1877) who married King William III of the Netherlands (1817–1890).
Thirdly on 15 April 1820 in Stuttgart he married another first cousin, Duchess Pauline Therese of Württemberg (1800–1873), a daughter of Duke Louis of Württemberg (1756–1817) and Princess Henrietta of Nassau-Weilburg (1780–1857), by whom he had one son and heir and two further daughters:
Princess Catherine of Württemberg (1821–1898) who married Prince Frederick of Württemberg (1808–1870) by whom she was the mother of King William II of Württemberg (born 1848–1921) the last King of Württemberg who succeeded his uncle King Charles I of Württemberg and ruled from 1891 until the abolition of the kingdom in 1918.
King Charles I of Württemberg (born 1823–1891), who succeeded his father as king of Württemberg. A homosexual, he married Grand Duchess Olga Nikolaevna of Russia, the daughter of Tsar Nicholas I of Russia, and leaving no issue was succeeded by his nephew King William II of Württemberg (born 1848–1921);
Princess Augusta of Württemberg (1826–1898) who married Prince Hermann of Saxe-Weimar-Eisenach (1825–1901). One of her daughters, Pauline of Saxe-Weimar-Eisenach, married Charles Augustus, Hereditary Grand Duke of Saxe-Weimar-Eisenach.Memorials
1st Cannstatter Volksfest 1818-2018
On 28 September 1818, one day after the king's 36th birthday, a big agricultural festival with horse races and prize-giving for outstanding cattle-breeding achievements is celebrated on the so-called Cannstatter Wasen site. Named the "Landwirtschaftliche Fest zu Kannstadt" (Kannstadt Agricultural Festival), it is therefore the 1st Cannstatter Volksfest. 
200 years later Cannstatter Volksfest and the 100th Landwirtschaftliches Hauptfest will be celebrated with a historical Volksfest on Stuttgart's Schlossplatz square.  Cannstatter Volksfest and the 100th Landwirtschaftliches Hauptfest (an agricultural show)—the founding of the biggest festival in "Ländle", as the state of Baden-Württemberg is affectionately known, by King Wilhelm I and his wife Katharina will be remembered in the heart of Stuttgart on the Schlossplatz square from 26 September to 3 October 2018.
 At the Historical Volksfest 2018 with King Wilhelm I and his wife Katharina (actors) will be dressed in historical costumes dating back to 1818.
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