William George Sydney Cadogan

Major The Hon. William George Sydney Cadogan MVO (31 January 1879 – 12 November 1914) was a British Army officer killed in the First World War. A son of the 5th Earl Cadogan, he had previously served in the Boer War, and was equerry to the Prince of Wales (later Edward VIII) from 1912 to 1914. He also played a single match of first-class cricket, for the Europeans team in the 1904 Bombay Presidency Match.

Cadogan was born in Chelsea, London. He was the fifth of seven sons born to the 5th Earl Cadogan and his wife, Lady Beatrix Jane Craven, a daughter of the 2nd Earl of Craven. The third son, Gerald Cadogan, succeeding to the earldom upon his father's death. Two other sons, Henry and Edward, were Conservative MPs, while another, Alexander, was a senior diplomat. William Cadogan was educated at Eton, where he played cricket for the school's First XI. From November 1896, he was a second lieutenant in the 4th (Eton College) Volunteer Battalion of The Oxfordshire Light Infantry. He went on to the Royal Military College, Sandhurst, and in February 1899 joined the 10th Royal Hussars. Cadogan was promoted lieutenant the following year, and saw action in the Boer War, where he was present at the Relief of Kimberley and for operations in the Transvaal, the Orange Free State, and the Cape Colony. He was promoted captain in March 1904.