restoration and decay of the Western empire of Charlemagne; the crusades of the Latins in the East: the conquests of the Saracens and Turks; the ruin of the Greek empire; the state and revolutions of Rome in the middle age. The historian may applaud the importance and variety of his subject; but while he is conscious of his own imperfections, he must often accuse the deficiency of his materials. It was among the ruins of the Capitol that I first conceived the idea of a work which has amused and exercised near twenty years of my life, and which, however inadequate to my own wishes, I finally delivered to the curiosity and candor of the public.

Lausanne, June 27 1787