After Ali's death the governor of Syria, Moawiya by name, succeeded in making himself caliph of the Moslem world. This usurper converted the caliphate into a hereditary, instead of an elective, office, and established the dynasty of the Ommiads. [17] Their capital was no longer Medina in Arabia, but the Syrian city of Damascus. The descendants of Mohammed's family refused, however, to recognize the Ommiads as legitimate caliphs. In 750 A.D. a sudden revolt, headed by the party of the Abbasids, [18] established a new dynasty. The Abbasids treacherously murdered nearly all the members of the Ommiad family, but one survivor escaped to Spain, where he founded at Cordova an independent Ommiad dynasty. [19] North Africa, also, before long separated itself from Abbasid rule. Thus the once united caliphate, like the old Roman Empire, split in twain. THE ABBASID CALIPHS, 750-1058 A.D. The Abbasids continued to reign over the Moslems in Asia for more than three hundred years. The most celebrated of Abbasid caliphs was Harun-al- Rashid (Aaron the Just), a contemporary of Charlemagne, to whom the Arab ruler sent several presents, including an elephant and a water-clock which struck the hours. The tales of Harun-al-Rashid's magnificence, his gold and silver, his silks and gems, his rugs and tapestries, reflect the luxurious life of the Abbasid rulers. Gradually, however, their power declined, and in 1058 A.D. the Seljuk Turks, [20] recent converts to Islam, deprived them of their power. A Turkish chieftain, with the title of "King of the East and West," then took the place of the Arabian caliph, though the latter remained the religious head of Islam. He lost even this spiritual authority, just two centuries later, when the Mongols from central Asia overran the Turkish dominions. [21] BAGDAD The Abbasids removed their capital from Damascus to Bagdad on the banks of the middle Euphrates. The new city, under the fostering care of the caliphs, grew with great rapidity. Its population in the ninth century is said to have reached two millions. For a time it was the largest and richest city in the Moslem world. How its splendor impressed the imagination may be seen from the stories of the _Thousand and One Nights_. [22] After the extinction of the Abbasid caliphate, its importance as the religious and political center of Islam declined. But memories of the former grandeur of Bagdad still cling to it, and even to-day it is referred to in Turkish official documents as the "glorious city." EXTINCTION OF THE ARABIAN EMPIRE A MISFORTUNE It was a very great misfortune for the eastern world when the Arabian Empire passed under the control of rude Asiatic peoples. The Turks accepted Islam, but they did little to preserve and extend Arabian civilization. The stagnant, non-progressive condition of the East at the present time is largely due to the misgovernment of its Turkish conquerors. 136. ARABIAN CIVILIZATION THE ARABS AS ABSORBERS OF CIVILIZATION