She was born in Lincolnshire, the daughter of Sir Arthur and Winifred Mary Colegate, and was educated at Runton Hill School in Norfolk. She lived at Midford Castle near Bath, England, until 2007. Anthony Blond set up his own firm in 1952, Anthony Blond (London) Ltd, in partnership with Isabel Colegate. 
In 1953 she married Michael Briggs, and the couple have two sons and a daughter.
Awards and honours
- W.H. Smith Literary award for The Shooting Party, 1981
- Fellow of the Royal Society of Literature, 1981
- Honorary M.A., University of Bath, 1988
- The Blackmailer, 1958
- A Man of Power, 1960
- The Great Occasion, 1962
- Statues in a Garden, 1964
- Orlando King, 1968
- Orlando at the Brazen Threshold, 1971
- Agatha, 1973
- News from the City of the Sun, 1979
- The Shooting Party, 1980
- A Glimpse of Sion’s Glory, 1985
- Deceits of Time, 1988
- The Summer of the Royal Visit, 1991
- The Winter Journey, 1995
- A Pelican in the Wilderness: Hermits, Solitaries, and Recluses, 2001
- Elizabeth Sleeman, International Who's Who of Women, 2002.
- ISABEL COLEGATE, 1931 –, University of South Carolina.
- The Shooting Party, 1985, IMDB.
- Isabel (Diana) Colegate Biography
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