After the death of the Prophet of Mecca, his lieutenants and the companions of his first exploits carried on his great work. The sight of conquered provinces only increased the fanaticism and the bravery of the Saracens. They had no fear of death in the field of battle, for, according to the words of their prophet, paradise, with all its voluptuous pleasures, awaited those who precipitated themselves upon the enemy, and behind them hell opened its abysses. Their conquests were so much the more rapid, from their uniting, in their military and religious government, the prompt decision of despotism with all the passions that are met with in a republic. Masters of Persia and Syria, they soon took possession of Egypt; their victorious battalions flowed on into Africa, planted the standard of the Prophet upon the ruins of Carthage, and carried the terror of their arms to the shores of the Atlantic. From India to the Straits of Cadiz, and from the Caspian Sea to the ocean, language, manners, religion, everything was changed; what had remained of Paganism was annihilated, together with the worship of the Magi; Christianity scarcely subsisted, and Europe itself was threatened with a similar destruction. Constantinople, which was the bulwark of the West, saw before its walls innumerable hordes of Saracens: several times besieged both by sea and land, the city of Constantine only owed its safety to the Greek fire, to the assistance of the Bulgarians, and to the inexperience of the Arabs in the art of navigation. During the first age of the Hegira, the conquests of the Mussulmans were only bounded by the sea which separated them from Europe; but when they had constructed vessels, no nation was safe from their invasion; they ravaged the isles of the Mediterranean, the coasts of Italy and Greece; fortune or treason made them masters of Spain, where they overturned the monarchy of the Goths; they took advantage of the weakness of the children of Clovis to penetrate into the southern provinces of Gaul, and were only stopped in their invasions by the victories of Charles Martel.