A superb Mameluke to the Regimental Equerry to His Royal Highness the Prince of Wales.
 
Sir Stanley de Astel Calvert Clarke, GCVO, CMG (died 29 November 1911) was a British Army officer and courtier.
Clarke was the son of John Frederick Sales Calvert-Clarke. He was educated at the Royal Military College, Sandhurst and commissioned into the 13th Hussars. He subsequently exchanged into the 4th Queen's Own Hussars and served with the regiment in India for five years.
On 15 September 1867 he married Mary Temple Rose, daughter of Sir John Rose, 1st Baronet.He and his wife were present at the 1877 Delhi Durbar. He went on to have 5 children, Edith, Millicent, Florence, Frederick and Albert.
In 1878 Clarke, who was by this time a colonel, was appointed Equerry to the Prince of Wales and in 1886 he became Private Secretary to the Princess of Wales. He was promoted major-general in 1894 and invested as a Knight Commander of the Royal Victorian Order in 1897. After successfully taking part in the arrangements for the Coronation of King Edward VII and Queen Alexandra, he was invested as a Knight Grand Cross of the Royal Victorian Order (GCVO) two days after the ceremony, on 11 August 1902. He held the office of Clerk Marshal and Chief Equerry to Edward VII from 1 January 1904 and was Serjeant-at-Arms in the House of Lords from 1910 until he resigned in November.