Decline and Fall of the Roman Empire, vol 1 by Edward Gibbon
Decline and Fall of the Roman Empire, vol 1
The author spent a good part of his life working on Decline and Fall, and as each volume was undertaken he compared it to the birth of a child. His theory is not without criticism, but in general the causes of the Fall were the weakening of civic "Roman" virtues (such as their military spirit), the apathy that Christianity bred in its culture, and the eventual invasion of barbarian hordes that had become a fixture of Rome and its territories. Whatever the legacy of his work, Gibbon's use of primary sources over secondary texts cemented his fame as the "first modern historian."