She was the second daughter of George Lyttelton, 4th Baron Lyttelton and his wife, Mary, née Glynne, whose sister married W. E. Gladstone.
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A daughter of George Lyttelton, 4th Baron Lyttelton, she married into another aristocratic family, the Cavendishes, in 1864.
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Lord Howard de Walden married Lady Lucy Cavendish-Scott-Bentinck (c. 1813 – 29 July 1899), daughter of William Cavendish-Scott-Bentinck, 4th Duke of Portland, at All Souls' Church in Marylebone on 8 November 1828.