On 4 July 1927, Joan married
Loel Guinness, at
St Margaret's, Westminster, in London. Guinness, a British Conservative
Member of Parliament, was the only son of Irish lawyer
Benjamin Seymour Guinness (of the
Guinness brewing family) and his first wife, Bridget Henrietta Frances
Williams-Bulkeley. They had one son: • Patrick Benjamin Guinness (1931–1965), who married
Baroness Dolores von Fürstenberg-Hedringen (1936–2012), his stepsister from his father's third marriage, on 22 October 1955 in Paris. Joan left Guinness for
Prince Aly Khan, the eldest son of the
Aga Khan III, the 48th Imam of the Nizari Ismailis, and Guinness successfully sued Joan and Khan on grounds of adultery. Joan and Khan did not defend the charges and the judge,
Mr Justice Bucknill, granted Guinness a
decree nisi and full custody of their son and ordered Khan to pay court costs.
Second marriage A few days after the divorce from Guinness was effective, on 18 May 1936, in Paris, Joan Yarde-Buller married
Prince Aly Khan. Before the wedding, Yarde-Buller converted to Islam and took the name "Taj-ud-dawlah", meaning "Crown of the Realm". Yarde-Buller and Khan had two sons: •
Aga Khan IV (1936–2025) • Prince
Amyn Aga Khan (b. 1937). They divorced in 1949 and the Prince later married
Rita Hayworth.
Third marriage In March 1986, Joan married lastly
Seymour Berry, 2nd Viscount Camrose, a newspaper magnate. They had been friends for more than thirty years. They lived at
Hackwood Park, the Camrose home in Hampshire. After his death in 1995, she was known as the Dowager Viscountess Camrose, also known as Joan, Viscountess Camrose. ==Ancestry==