The unsatisfactory nature of the information afforded by the defective chronicles of the eighth century is a serious impediment to the satisfactory elucidation of events whose paramount importance has been recognized by every historian. A lamentable want of detail, and an utter absence of philosophical discrimination, are the characteristic traits of these illiterate annalists. Of the gradual unfolding of national character; of the secret motives which actuated the rude but dexterous statesmen of that epoch; of the incessant mutations of public policy; of the silent but powerful revolutions effected by the inexorable laws of nature and the failings of humanity, they tell us next to nothing. And yet no period mentioned in history has been more prolific of great events. No achievement of ancient or modern times was perfected with such rapidity or produced such decided effects upon the intellectual progress of the human race as the Mohammedan Conquest of Spain. The valor of the idolater, Charles Martel, prepared the way for the vast empire and boundless authority of Charlemagne. The zeal of his orthodox successor assured the permanence and supremacy of the Holy See. Upon the success or failure of the Moslem crusade hung, as in a balance, the political fortunes of Europe and the religious destiny of the world. The battle of Poitiers was not, as is generally asserted, a contest between the champions of two hostile forms of faith, for the army of the Franks was largely composed of Pagans, and the ranks of the invaders were filled with Berbers, Jews, and infidels. Moslem zealots, like those who had shared the bitter privations of the Prophet, who had upheld his falling banner at Ohod, who had prevailed over fearful odds commanded by the bravest generals of the Roman and Persian empires, who had witnessed the capture of Damascus and Jerusalem, were rare in that motley host of adventurers whose religion was frequently a disguise assumed for the ignoble purpose of rapine. The fierce ardor and invincible spirit of the original Mussulmans had departed. A tithe of the fiery enthusiasm which had evoked the astonishment and consternation of their early antagonists must have changed the fortunes of that eventful day.