Frances Shand Kydd, 68, mother of the late Princess Diana, died yesterday, said a spokesman for her son, Earl Spencer.
Mrs. Shand Kydd's health had been failing in recent months. The grandmother of Princes William and Harry, she had an often-turbulent relationship with Diana and lived reclusively.
She was born Frances Ruth Burke Roche, daughter of the Fourth Baron Fermoy. Her mother, Lady Ruth Fermoy, was a confidante and lady in waiting to the Queen Mother and was said to have promoted Diana's marriage to Prince Charles.
She married Edward John Spencer in 1954 at Westminster Abbey. They had three daughters - Diana was the youngest - and a son.
She fell in love with Peter Shand Kydd and divorced her husband in 1969, when Diana was 6 years old.
Mrs. Shand Kydd acknowledged a strained relationship with her daughter.
Testifying two years ago at the theft trial of Diana's former butler, Paul Burrell, Mrs. Shand Kydd said she did not speak to Diana in the last four months of her daughter's life and that the princess had returned her letters unopened.