What, one might ask, is The Diary of a Public Man, and why should subscribers to The Journal of the Gilded Age and the Progressive Era want to know about it? The diary purportedly dates from the tension-filled weeks preceding the outbreak of the Civil War, but it was first published in a popular magazine in 1879. Its appearance then suggested that somebody thought it would attract an audience of Gilded Age readers, which indeed happened. Their curiosity was intensified because the diary's publisher concealed the identity of its author. We now know why the alleged diarist had to be cloaked in anonymity—the supposed prewar diary actually was written shortly before its publication, long into the postwar era. Most outrageously, the diarist proves to have been an imaginary construct—not a real person.