In the victorious days of the Roman republic, it had been the aim of the senate to confine their councils and legions to a single war, and completely to suppress a first enemy before they provoked the hostilities of a second. These timid maxims of policy were disdained by the magnanimity or enthusiasm of the Arabian caliphs. With the same vigor and success they invaded the successors of Augustus and those of Artaxerxes; and the rival monarchies at the same instant became the prey of an enemy whom they had been so long accustomed to despise. In the ten years of the administration of Omar, the Saracens reduced to his obedience thirty-six thousand cities or castles, destroyed four thousand churches or temples of the unbelievers, and edified fourteen hundred moschs for the exercise of the religion of Mahomet. One hundred years after his flight from Mecca, the arms and the reign of his successors extended from India to the Atlantic Ocean, over the various and distant provinces, which may be comprised under the names of, I. Persia; II. Syria; III. Egypt; IV. Africa; and, V. Spain. Under this general division, I shall proceed to unfold these memorable transactions; despatching with brevity the remote and less interesting conquests of the East, and reserving a fuller narrative for those domestic countries which had been included within the pale of the Roman empire. Yet I must excuse my own defects by a just complaint of the blindness and insufficiency of my guides. The Greeks, so loquacious in controversy, have not been anxious to celebrate the triumphs of their enemies. After a century of ignorance, the first annals of the Mussulmans were collected in a great measure from the voice of tradition. Among the numerous productions of Arabic and Persian literature, our interpreters have selected the imperfect sketches of a more recent age. The art and genius of history have ever been unknown to the Asiatics; they are ignorant of the laws of criticism; and our monkish chronicle of the same period may be compared to their most popular works, which are never vivified by the spirit of philosophy and freedom. The _Oriental library_ of a Frenchman would instruct the most learned mufti of the East; and perhaps the Arabs might not find in a single historian so clear and comprehensive a narrative of their own exploits as that which will be deduced in the ensuing sheets.