From the examples given above of the toleration extended towards the Christian Arabs by the victorious Muslims of the first century of the Hijrah and continued by succeeding generations, we may surely infer that those Christian tribes that did embrace Islam, did so of their own choice and free will. [66] The Christian Arabs of the present day, dwelling in the midst of a Muhammadan population, are a living testimony of this toleration; Layard speaks of having come across an encampment of Christian Arabs at al-Karak, to the east of the Dead Sea, who differed in no way, either in dress or in manners, from the Muslim Arabs. [67] Burckhardt was told by the monks of Mount Sinai that in the last century there still remained several families of Christian Bedouins who had not embraced Islam, and that the last of them, an old woman, died in 1750, and was buried in the garden of the convent. [68] Many of the Arabs of the renowned tribe of the Banū Ghassān, Arabs of the purest blood, who embraced Christianity towards the end of the fourth century, still retain the Christian faith, and since their submission to the Church of Rome, about two centuries ago, employ the Arabic language in their religious services. [69] If we turn from the Bedouins to consider the attitude of the settled inhabitants of the towns and the non-Arab population towards the new religion, we do not find that the Arab conquest was so rapidly followed by conversions to Islam. The Christians of the great cities of the eastern provinces of the Byzantine empire seem for the most part to have remained faithful to their ancestral creed, to which indeed they still in large numbers cling. In order that we may fully appreciate their condition under the Muslim rule, and estimate the influences that led to occasional conversions, it will be well briefly to sketch their situation under the Christian rule of the Byzantine empire which fell back before the Arab arms.