Anthony Eden
He had an operation to remove gallstones in 1953. The operation went wrong, and his health was ruined. He became Prime Minister in 1955 when Winston Churchill retired. He resigned as Prime Minister in 1957, and Harold Macmillan replaced him. The Suez Crisis of 1956 was a critical period. This and his health led up to his resignation as Prime Minister. Eden died of liver cancer, aged 79. His widow, Clarissa Eden, Countess of Avon, was born in 1920 and died in 2021. She was a niece of Winston Churchill.