The first branch descends from Frederick I of Württemberg. This branch became extinct at the death of William II of Württemberg in 1921. The second branch descends from Duke Louis of Württemberg, and belonged to the Teck family. This branch became extinct at the death of George Cambridge, 2nd Marquess of Cambridge in 1981.
Frederick, Hereditary Prince of Württemberg, later Duke of Württemberg, and Frederick I, King of Württemberg (1805), was the eldest son of Duke Frederick Eugene of Württemberg and Frederica, daughter of Frederick, Margrave of Brandenburg-Schwedt. He married, firstly, in 1780, Augusta, eldest daughter of Charles II, Duke of Brunswick, by whom he had four children, and secondly, in 1797 ...
Prince Paul of Württemberg (Paul Heinrich Karl Friedrich August; 19 January 1785 – 16 April 1852) was the fourth child and second son of King Frederick I and his wife, Duchess Augusta of Brunswick-Wolfenbüttel.
Biography Son of Frederick II Eugene, Duke of Württemberg; 1780, married Duchess Augusta of Brunswick-Wolfenbüttel, daughter of Charles William Ferdinand, Duke of Brunswick-Lüneburg and Princess Augusta of Great Britain, they separated in 1786 and she died two years later; 1797, married Charlotte, Princess Royal (q.v.), daughter of George III (q.v.) of England.
William was born the son of Prince Frederick of Württemberg (1808–1870) by his wife Princess Catherine Frederica of Württemberg (1821–1898), herself the daughter of King William I of Württemberg (1781–1864). His parents were first cousins, being the children of two brothers, and William was their only child.
Frederick assumed the title Prince-Elector (German language: Kurfürst) on 25 February 1803, and was thereafter known as the Elector of Württemberg. The reorganization of the Empire also secured the new Elector control of various ecclesiastical territories and former free cities , thus greatly increasing the size of his domains.
Augusta and Frederick I of Württemberg had four children: Prince William of Württemberg (1781–1864), who succeeded his father as King of Württemberg. Princess Catherine of Württemberg (1783–1835), who married Jérôme Bonaparte, King of Westphalia. Duchess Sophia Dorothea of Württemberg (1783–1784) died young.