Among the results of this change of the capital was, firstly, that the Empire gradually separated into East and West; secondly, that Constantinople became the centre of culture, and, as darkness settled down upon the West, the almost sole refuge of learning and the arts. In the beginning Roman architects directed the character of the new city, but even then the artisans who executed the work were either Byzantines or Greeks, attracted to the new city from various parts of Hellas and Asia Minor. In consequence architecture and the other arts gradually became impressed with a new character, which, for convenience’ sake, is styled Byzantine. It represents, in the case of architecture, a mixture of Roman, Greek, and Oriental; and involved, as we shall see, the treatment of old principles in a new spirit of invention. The change was encouraged by the contact of Byzantium with Eastern and African civilisation. For as the Western Empire declined in power, the Eastern grew; extending its sway in Asia, where it came into conflict with the Parthians and Persians, and along the northern littoral of Africa. The Metropolitan Bishop of Byzantium became to the Eastern Churches what the Metropolitan Bishop of Rome was to the Western; and exercised a spiritual headship over the Coptic Church in Alexandria, the Syrian Church in Antioch, the Nestorian Church in Ctesiphon, and the Armenian in Asia. Over this widely spread area religious art flourished, coloured in each locality by racial influences, all of which influences in a measure reacted upon the capital city of Byzantium. Meanwhile, in the West, the Church was labouring to reorganise a settled condition of society by assisting the consolidation of authority. A case in point is the welding of the Frankish tribes into some semblance of a nation. By 486 they had found a great leader in Clovis, who led them across the Rhine, conquered the Romans at Soissons, and proceeded to extend his sway over Gaul. To consolidate his power he married Clotilda, a princess of the Burgundian Goths, and accepted her faith of Christianity. It chanced that she professed the orthodox belief, unlike the majority of the Burgundians and the other German tribes at this time in Gaul, who were Arians. Consequently the Roman Church threw the weight of its influence on the side of Clovis and helped him to found a monarchy in France that endured under the title of Merovingian, so called from Merovech, the grandfather of Clovis.