Without in any way giving up the Pan-Islamic idea, Turkish Nationalism could not but support the Pan-Turanian movement, which it hoped would add the 18 million Turks living in the former Russian Empire, Persia, and Afghanistan, to the 8 million Turks of the territories of the Ottoman Empire. Owing to its origin and the character it has assumed, together with the geographical situation and importance of the populations concerned, this movement appears as a powerful obstacle to the policy which England seems intent upon pursuing, and to which she seeks to bring over Italy and France. It also exemplifies the latent antagonism which had ever existed between the Arabian world and the Turkish world, and which, under the pressure of events, soon asserted itself. Indeed, the mutual relations of the Arabs and the Turks had been slowly but deeply modified in the course of centuries. After the great Islamic movement started by Mohammed in the seventh century, the Arabs who had hitherto been mostly confined within the boundaries of the Arabian peninsula spread to the west over the whole of Northern Africa as far as Spain, and to the east over Mesopotamia and a part of Persia. In the twelfth century Arabian culture reached its climax, for the Arabian Caliphs of Baghdad ruled over huge territories. At that time Arabic translations revealed to Europe the works of Aristotle and of the Chaldean astronomers, and the Arabs, through Spain, had an important influence on the first period of modern civilisation. In 1453, when the Turks, who had extended their dominion over all the shores of the Mediterranean, settled at Constantinople, which became the capital of the Islamic Empire, the influence of Arabia decreased; yet the Arabs still enjoyed in various parts political independence and a kind of religious predominance. For instance, the Arabs settled in the north of Western Africa, after losing Spain, became quite independent, and formed the Empire of Morocco, which was not under the suzerainty of Constantinople.