They take as their material the behaviour and decisions that led to the decay and eventual fall of the Roman Empire in the East and West, offering an explanation for why the Roman Empire fell.
Ulysses S. Grant, Theodore Roosevelt, Benvenuto Cellini, Horatio Alger, Jr, Charles Darwin, Jacob Abbott, Frank Lewis Dyer, Victor Hugo, Lytton Strachey, William M. Thayer, W.H.G. Kingston, John G. Nicolay, John T. Morse Jr., Edward Gibbon, Rabindranath Tagore, Oliver Wendell Holmes, John Stuart Mill, Albert Keim, Louis Lumet, Anthony Trollope & John Rae