Edward Gibbon,
History of the Decline and Fall of the Roman Empire…
“ The effeminate luxury, which infected the manners of courts and cities, had instilled a secret and destructive poison into the camps of the legions; and their degeneracy has been marked by the pen of a military writer, who had accurately studied the genuine and ancient principles of Roman discipline. It is the just and important observation of Vegetius, that the infantry was invariably covered with defensive armor, from the foundation of the city, to the reign of the emperor Gratian. ”
