When did Margaret Georgiana Spencer's husband die?
John Spencer, 1st Earl Spencer John Spencer, 1st Earl Spencer (19 December 1734 – 31 October 1783) was a British peer and politician.
Laura Spencer-Churchill, Duchess of Marlborough Frances Laura Spencer-Churchill, Duchess of Marlborough ("née" Charteris; 10 August 1915 – 19 February 1990), was a British noblewoman and socialite. She was variously Viscountess Long, Countess of Dudley and became Duchess of Marlborough upon her fourth marriage, to John Spencer-Churchill, 10th Duke of Marlborough. She was the sister of novelist Hugo Charteris and Ann Charteris (who married Ian Fleming), as well as the granddaughter of Hugo Charteris, 11th Earl of Wemyss. Her third husband, Michael Temple Canfield, was the former husband of Lee Radziwill, sister of Jacqueline Kennedy Onassis. During World War II, she served as an auxiliary nurse.