this community of life and to promote intercourse between the several parts. Such an understanding has by no means always produced sympathy or friendliness, and the various movements as they have passed from one part to the other have often been considerably modified in the passage; but the motive power behind a movement in Persia has been intelligible in Muslim Spain--though perhaps intensely disliked there--and most often a movement beginning in any one district has sooner or later had some contact with every other district. There is no such division in Islam as that which prevents the average English churchman from knowing about and appreciating a religious movement at work in the Coptic or Serbian church. The common life of Islam is largely based on the use of the Arabic language as the medium of daily life, or at least of prayer and the medium of scholarship, and this was extremely effective before the inclusion of large Turkish and Indian elements which have never really become Arabic speaking. It was this which made the Arabic speaking community of Islam so favourable a medium of cultural transmission. The `Umayyad period was a marking time during which this common life was being evolved, and with it was evolved necessarily the bitterness of sectarian and faction divisions which always result when divergent types are in too close contact with one another. CHAPTER III THE COMING OF THE `ABBASIDS The rule of the `Umayyads had been a period of tyrannical oppression on the part of the Arab rulers upon their non-Arab subjects and especially upon the _mawali_ or converts drawn from the native population of the conquered provinces who not only were not admitted to equality, as was the professed principle of the religion of Islam, but were treated simply as serfs. This was in no sense due to religious persecution, for it was the converts who were the most aggrieved, nor was it due to a racial antipathy as between a Semitic and an Aryan people, nor yet to anything that could be described as a “national” feeling on the part of the Persians and other conquered races, but simply a species of “class” feeling due to the contempt felt by the Arabs for those whom they had conquered and hatred on the part of the conquered towards their arrogant masters, a hatred intensified by disgust at their misgovernment and ignorance of the traditions of civilization. There were other causes also which helped to intensify this feeling of hatred especially in the case of the Persians. Amongst these was a semi-religious feeling, even amongst those who had become converts to Islam. It had been the old usage of the Persians to regard the Sasanid kings, the descendants of the legendary _kayani_ dynasty of heroes who had first established a settled community in Persia, as _bagh_ not quite perhaps what we should understand as “gods,” but rather as incarnations of deity, the divine spirit passing on by