From The Holy Mountain by William Dalrymple Page A

saucers full of oily vegetable delicacies. Their heads were shrouded under swathes of elaborate turban wraps, but their faces were uncovered and their cheeks were tattooed with crosses and swastika designs. Behind them a cauldron of pilaff steamed on a fire.
    Urfa has always been a frontier town, filled with an explosive mix of different nationalities. At the time of John Moschos it lay on the most sensitive frontier in the world, separating the two great powers of late antiquity: Persia and Byzantium. As one of only two legal crossing points from East to West, Edessa - and especially the members of its large merchant class - grew plump on the trade which passed between the pair of hostile empires. From Byzantium the Persians bought gold and manuscript vellum; from Persia the Byzantines purchased Indian spices, Chinese silk and, above all, dark-skinned Asian slave girls. The Imperial treasury became rich from the customs duties - 12 .5 per cent - levied on this merchandise, and checks at the border were rigorous. When Apollonius of Tyana, a pagan sage and wonder-worker, returned from a missionary journey to India and the East, he was asked by the Imperial customs officer what he had to declare, and replied: 'Temperance, virtue, justice, chastity, fortitude and industry.' The customs officer had heard all this before. 'Where have you hidden the girls?' he demanded.
    Merchants were not the only people to cross the divide. Edessa was one of the great Byzantine university towns, and the scholars it attracted from Persia and beyond led to a rich cross-fertilisation of ideas in its lecture halls. There was a marked influence of Persian and Indian ideas on Edessa's theology, and its theological school became notorious for the dangerous heterodoxy of its teachings. In this cosmopolitan environment the city's most notorious heretic, Bardaisan of Edessa, was able to write an accurate account of the dietary regimes of Hindu priests and Buddhist monks, while Indian stories and legends came to be written down in unexpected new Christian incarnations: it may have been through Edessa that the Life of the Buddha passed into Byzantine (and ultimately Western) monastic libraries.
    It was not a one-way traffic. There was a School of the Persians in Edessa, and in the sixth century no fewer than three Patriarchs of the Persian-based Nestorian Church were recorded as having spent much of their youth in Edessa studying Greek medicine and philosophy. Built as it was on the philosophical faultline that ran between the Eastern and Western worlds, Edessa became a great crucible fizzing with strange heresies and exotic Gnostic doctrines. One sect, the Elchasiates, believed that two gigantic angels had appeared to their founder, Elchasaios, and told him that Christ was reincarnated century after century, and that each time he was born of a virgin. The angels also instructed Elchasaios that his followers should venerate water as the source of life, and passed on a mystic formula to be used whenever members of the cult were bitten by a mad dog or a snake. To add to the richness of the mix, the Elchasiates observed the ancient Jewish Mosaic laws, circumcising their male children and scrupulously keeping the Sabbath, as well as holding out against new-fangled innovations to the New Testament such as the Letters of St Paul.
    More unorthodox still were the Marcionites, who took a rather different attitude to Judaism: they believed that the stern Jehovah of the Old Testament was different from - and indeed was the enemy of - the true, kind, creator-God of the New Testament. If this was so, then, logically, the heroes of the Old Testament were actually villains: all over Edessa Marcionite churches rang with praise of Cain, the Sodomites, Nebuchadnezzar and, above all, the Serpent of the Garden of Eden.
    In contrast, the Messalians, bitter enemies of the Marcionites, looked on the Cross as the object of their loathing, and refused to revere Mary as the mother of