Christianity was introduced early in Albania, having been brought in during the period of Roman rule. After the division of the Roman Empire into East and West in 395, Albania became politically a part of the Eastern, or Byzantine, Empire but remained ecclesiastically dependent on Rome. When, however, the final schism occurred in 1054 between the Roman and Eastern churches, the Christians in the southern part of the country came under the jurisdiction of the Constantinople Ecumenical Patriarchate. This situation prevailed until the Turkish invasions of the fourteenth century, when the Islamic faith was introduced. The apostasy of the people took many decades. In the mountainous north the propagation of Islam met strong resistance from the Catholics. Gradually, however, backwardness, illiteracy, the absence of an educated clergy, and material inducements weakened resistance. Coerced conversions occurred, especially when Catholic powers, such as the Venetian Republic and Austria, were at war with the Ottoman Empire. By the close of the seventeenth century the Catholics in the north were outnumbered by the Muslims. Large-scale forced conversions among the Orthodox in the south did not occur until the Russo-Turkish wars of the eighteenth century. Islamic pressure was put on the Orthodox Christians because the Turks considered them sympathetic to Orthodox Russia. The situation of the Orthodox improved temporarily after a Russo-Turkish treaty of 1774 in which Russia was recognized as the protector of the Orthodox Christians in the Ottoman Empire. The most effective method employed by the Turks in their missionary efforts, especially in the central and southern parts of the country, was the creation of a titled noble Muslim class of _pashas_, _beys_, and _agas_ (Albanian tribal chiefs in Turkish service), who were endowed with both large estates and extensive political and governing powers. Through their political and economic influences these nobles controlled the peasants, large numbers of whom were converted to Islam either through coercion or through promise of economic benefits. In the period from independence to the Communist seizure of power, the Muslim noble class composed the country's ruling elite, but this elite never interfered with religious freedom, which was sanctioned by the various pre-World War II constitutions. The church and state were separate. These constitutions had declared that the country had no official religion, that all religions and faiths were respected, and that their freedom of exercise was assured. These provisions had expressed the true feelings of the people who, whether Muslim, Eastern Orthodox, or Roman Catholic, were tolerant on religious matters.