About Clarissa Eden
Anne Clarissa Eden, Countess of Avon was an English memoirist and the second wife of Anthony Eden, who served as British prime minister from 1955 to 1957. She married Eden in 1952, becoming Lady Eden in 1954 when he was made Knight Companion of the Garter, before becoming Countess of Avon in 1961 when her husband was created Earl of Avon. In 2007, at 87, she released her memoir subtitled From Churchill to Eden. On the death of Lady Wilson of Rievaulx in 2018, Lady Avon became the oldest living spouse of a British prime minister. However, it was later discovered that her biological father was the Liberal politician Harold Baker, who had had an affair with Lady Gwendoline in 1919.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.