Geoffrey FitzClarence, 3rd Earl of Munster Geoffrey FitzClarence, 3rd Earl of Munster Geoffrey George Gordon FitzClarence, 3rd Earl of Munster, DSO (18 July 1859 – 2 February 1902), known as Lord Tewkesbury 1870–1901, was a British peer, and the great-grandson of King William IV by his mistress Dorothea Jordan. Born Geoffrey George Gordon FitzClarence, he was the son of William FitzClarence, 2nd Earl of Munster (19 May 1824 – 30 April 1901) and Wilhelmina Kennedy-Erskine (27 June 1830 – 9 October 1906). His parents were first cousins, thus making Geoffrey a great-grandson of William IV twice over. His grandfather on his paternal side was Lord George
Sophia Dorothea of Celle Duke of Brunswick-Lüneburg by his long-term mistress, Eleonore d'Esmier d'Olbreuse (1639–1722), Countess of Williamsburg, a Huguenot lady, the daughter of Alexander II d'Esmiers, Marquess of Olbreuse. George William eventually married Eleonore officially in 1676 (they had been married morganatically previously). There was some talk of marriage between Sophia Dorothea and the (then) future king of Denmark, but the reigning queen was talked out of it by Sophia of Hanover (her future mother-in-law). Another engagement, to the Duke of Brunswick-Wolfenbüttel, was broken off after Duchess Sophia convinced her brother-in-law of the advantage of having Sophia Dorothea marry her cousin. This occurred