James Gascoyne-Cecil, 4th Marquess of Salisbury son, David. James Gascoyne-Cecil, 4th Marquess of Salisbury James Edward Hubert Gascoyne-Cecil, 4th Marquess of Salisbury, (23 October 1861 – 4 April 1947), known as Viscount Cranborne from 1868 to 1903, was a British statesman. Born in London, Salisbury was the eldest son of Robert Gascoyne-Cecil, 3rd Marquess of Salisbury, who served as British Prime Minister, by his wife Georgina (née Alderson). The Right Reverend Lord William Cecil, Lord Cecil of Chelwood and Lord Quickswood were his younger brothers and Prime Minister Arthur Balfour his first cousin. He was educated at Eton and University College, Oxford, graduating BA in 1885.
Deputy Prime Minister of the United Kingdom and succeeded Winston Churchill's first premiership after their coalition broke up but only after a two-month interval when Attlee was not a member of the government. Anthony Eden succeeded Churchill after his second premiership, not because he had been Deputy Prime Minister, but because he had long been seen as Churchill's heir apparent and natural successor. The intermittent existence of a Deputy Prime Minister has been on occasion so informal that there have been a number of occasions on which dispute has arisen as to whether or not the title has actually been conferred. The position of Deputy Prime Minister