With a simple reasoning we could explain the theory that sustains the great book The Decline and Fall of the Roman Empire, hoisted by Edward Gibbon. That reasoning is: a society unavoidably subjected to material conditions can be described in terms of tragedy; a society ruled by reason, that is, one that is free, can be described in terms of epic; but a society compounded by rational beings that is deceived by material accidents and psychological illusions deserves to be described in terms of satire. The said book is a methodic, philosophical, elegant and perdurable jeer against irrational beings, whose pretext was Rome. The famous sentence of Gibbon, quoted here and there as a slogan of the said work, thus gets a meaning, and it says: history is “the register of the crimes and follies and misfortunes of mankind” (1).