'' by
Pompeo Batoni, 1762 On 29 January 1756, Anne married
Augustus Henry FitzRoy, Earl of Euston, at her father's house in
St James's Square, by special licence of the
Archbishop of Canterbury, as she was 18 and considered a minor. The marriage was witnessed by Lord Ravensworth and
Francis Seymour-Conway, 1st Earl of Hertford. The following year he succeeded as the 3rd Duke of Grafton. Together they had three children: • Lady Georgiana FitzRoy (8 May 1757 – 18 January 1799), who married
John Smyth on 4 June 1778, and had issue •
George Henry FitzRoy, 4th Duke of Grafton (14 January 1760 – 28 September 1844), who married
Lady Charlotte Maria Waldegrave, on 16 November 1784, and had issue • General
Lord Charles FitzRoy (14 July 1764 – 20 December 1829), who married, firstly, Frances Mundy on 20 June 1795, and had one son; he married, secondly, Lady Frances Stewart on 10 March 1799 and had three children. His sons Sir
Charles FitzRoy (1796–1858), Governor of
New South Wales, and
Vice-Admiral Robert FitzRoy, a hydrographer, were notable for their achievements. It was not a very amicable marriage. Grafton fathered 16 illegitimate children in his lifetime, and Anne supposedly had a "violent itch for play." They had attempted to renew their relationship with a trip to Florence but it was unsuccessful. In 1764, while the Duchess was pregnant with their second son, Grafton began a public affair with former prostitute
Anne Parsons, whom he brought without shame to
the Royal Opera. They separated the following year. In 1766, Walpole introduced her to an Anglo-Irish peer he had met in Paris,
John FitzPatrick, 2nd Earl of Upper Ossory, whom he called "one of the
prosperest and most amiable young men I ever knew". The Duchess gave birth to a daughter by Ossory in August 1768. Meanwhile, the Duke was gradually assuming control of the government during
Earl of Chatham's illness and death, and in October 1768 he effectively became the first Prime Minister, as Head of Ministry. He sued her for adultery and their marriage was dissolved by Act of Parliament, passed 23 March 1769. On 24 June 1769, Grafton married Elizabeth Wrottesley (1 November 1745 – 25 May 1822). Elizabeth was ironically Ossory's cousin, the daughter of his aunt Lady Mary Leveson-Gower and
Sir Richard Wrottesley, 7th Baronet, the
Dean of Worcester. ==Later life==