Margaret Campbell, Duchess of Argyll, née Ethel Margaret Whigham, was the only child of George Hay Whigham, a Scottish multi-millionaire businessman and his wife Helen Mann Hannay. She grew up mainly in New York City, where she attended the exclusive Hewitt School for girls. In 1930, she was presented at Court in London and was considered the debutante of the year. Shortly afterwards, she announced her engagement to Charles Guy Fulke Greville, 7th Earl of Warwick, however, the wedding never took place. Instead, in 1933, after converting to the Roman Catholic faith, she married Charles Sweeny, an American golfer and socialite, with whom she had three children. The couple divorced in 1947.
In 1951, she remarried to Ian Douglas Campbell, 11th Duke of Argyll. This marriage was marked by serious problems of alcoholism, drug use, financial extravagance, and suspected infidelity and by 1959 they were living separate lives. In 1963, the Duke accused his wife of adultery and produced sexually explicit Polaroid photographs of her with an unknown man or men. A sensational divorce trail ensued that made her name infamous. Margaret wrote her memoirs, entitled Forget Not, published in 1975. From the enormous wealth of her youth, she died in penury in 1993.