Cecilia Nina Cavendish-Bentinck was born at 50 Eaton Place in Belgravia, Westminster,[1][2] the eldest daughter of the Rev.

The Strathmore estates included two grand houses and their surroundings: Glamis Castle and St Paul's Walden Bury.

[8] During World War I, Glamis Castle served as a convalescent hospital for the wounded, in which she took an active part until she developed cancer and was forced into invalidity.

In January 1923 she celebrated the engagement of her youngest daughter, Elizabeth, to the King's son, Prince Albert, Duke of York, later George VI.

Lady Strathmore suffered a heart attack in April 1938 during the wedding of her granddaughter, Anne Bowes-Lyon (later Princess of Denmark), to Viscount Anson.