Lieutenant-Colonel Frederick Sadleir Brereton, CBE (5 August 1872 - 12 August 1957), also known as Captain Brereton, was a British Army medical officer and author of children's novels about heroic actions performed on behalf of the British Empire. Brereton joined the Royal Army Medical Corps (RAMC) as a surgeon-lieutenant on January 29, 1896, and was promoted to captain on January 29, 1899. During the Second Boer War, he served as a medical officer in the Scots Guards. He retired from his commission on November 22, 1902, following the conclusion of the South African War. Brereton returned to the RAMC during World War I, earning the rank of Brevet Lieutenant Colonel. In 1919, he was named Commander of the Portuguese Order of Aviz and CBE. Brereton married Ethel Lamb in 1898, and Isobel Murdoch in 1953.
