He married Margaret Grey, daughter of Edward Grey, Viscount Lisle, but they had no children. The earldom of Wiltshire became extinct on his death, though it was re-created for his cousin Henry Stafford, 1st Earl of Wiltshire.
Robert Anthony Eden, 1st Earl of Avon, KG, MC, PC (June 12, 1897– January 14, 1977), British politician, was Foreign Secretary during World War II and Prime Minister of the United Kingdom during the 1950s.
Eden retained his personal popularity and was made Earl of Avon in 1961.
The Earl of Avon died from liver cancer in Salisbury in 1977 at the age of 79.