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Captain Athelstan Horn Popkess CBE OStJ QPM (23 November 1893 – 29 April 1967) was Chief Constable of Nottingham City Police from 1930 to 1959 and as a result of his transformations in modernising policing could be considered the twentieth century's greatest police officer in the UK according to a 2020 biography. He achieved particular notoriety following an investigation into corruption in Nottingham City Council in an incident which became known as "The Popkess Affair" due to the false suspicion that he had leaked information.