The Mongol hordes under Húlágú captured Baghdád in 1258 A.D. and made an end of the Caliphate. Sweeping onward, they were checked by the Egyptian Mamelukes and retired into Persia, where, some fifty years afterwards, they embraced Islam. The successors of Húlágú, the Íl-kháns, reigned in Persia until a second wave of barbarians under Tímúr spread devastation and anarchy through Western Asia (1380-1405 A.D.). The unity of Islam, in a political sense, was now destroyed. Out of the chaos three Muḥammadan empires gradually took shape. In 1358 the Ottoman Turks crossed the Hellespont, in 1453 they entered Constantinople, and in 1517 Syria, Egypt, and Arabia were added to their dominions. Persia became an independent kingdom under the Ṣafawids (1502-1736); while in India the empire of the Great Moguls was founded by Bábur, a descendant of Tímúr, and gloriously maintained by his successors, Akbar and Awrangzíb (1525-1707). [Sidenote: Arabian literary history.] [Sidenote: Writers who are wholly or partly of foreign extraction.] Some of the political events which have been summarised above will be treated more fully in the body of this work; others will receive no more than a passing notice. The ideas which reveal themselves in Arabic literature are so intimately connected with the history of the people, and so incomprehensible apart from the external circumstances in which they arose, that I have found myself obliged to dwell at considerable length on various matters of historical interest, in order to bring out what is really characteristic and important from our special point of view. The space devoted to the early periods (500-750 A.D.) will not appear excessive if they are seen in their true light as the centre and heart of Arabian history. During the next hundred years Moslem civilisation reaches its zenith, but the Arabs recede more and more into the background. The Mongol invasion virtually obliterated their national life, though in Syria and Egypt they maintained their traditions of culture under Turkish rule, and in Spain we meet them struggling desperately against Christendom. Many centuries earlier, in the balmy days of the ‘Abbásid Empire, the Arabs _pur sang_ contributed only a comparatively small share to the literature which bears their name. I have not, however, enforced the test of nationality so strictly as to exclude all foreigners or men of mixed origin who wrote in Arabic. It may be said that the work of Persians (who even nowadays are accustomed to use Arabic when writing on theological and philosophical subjects) cannot illustrate the history of Arabian thought, but only the influence exerted upon Arabian thought by Persian ideas, and that consequently it must stand aside unless admitted for this definite purpose. But what shall we do in the case of those numerous and celebrated authors who are neither wholly Arab nor wholly Persian, but unite the blood of both