It has already been indicated that the Serbs and Croats occupied territory which, while the Church was still one, was divided between two dioceses, Italy and Dacia, and when the Church itself was divided, in the eleventh century, was torn apart between the two beliefs. The dividing line between the jurisdictions of Rome and Constantinople ran from north to south through Bosnia, but naturally there has always been a certain vagueness about the extent of their respective jurisdictions. In later years the terms Croat and Roman Catholic on the one hand, and Serb and Orthodox on the other, became interchangeable. Hercegovina and eastern Bosnia have always been predominantly Orthodox, Dalmatia and western Bosnia predominantly Roman Catholic. The loyalty of the Croatians to Austria-Hungary has been largely owing to the influence of Roman Catholicism. During the first centuries of Serbian history Christianity made slow progress in the western half of the Balkan peninsula. The Dalmatian coast was always under the influence of Rome, but the interior was long pagan. It is doubtful whether the brothers Cyril and Methodius (cf. chap. 5) actually passed through Serb territory, but in the tenth century their teachings and writings were certainly current there. At the time of the division of the Churches all the Serb lands except the Dalmatian coast, Croatia, and western Bosnia, were faithful to Constantinople, and the Greek hierarchy obtained complete control of the ecclesiastical administration. The elaborate organisation and opulent character of the Eastern Church was, however, especially in the hands of the Greeks, not congenial to the Serbs, and during the eleventh and twelfth centuries the Bogomil heresy (cf. chap, 6), a much more primitive and democratic form of Christianity, already familiar in the East as the Manichaean heresy, took hold of the Serbs’ imagination and made as rapid and disquieting progress in their country as it had already done in the neighbouring Bulgaria; inasmuch as the Greek hierarchy considered this teaching to be socialistic, subversive, and highly dangerous to the ecclesiastical supremacy of Constantinople, all of which indeed it was, adherence to it became amongst the Serbs a direct expression of patriotism. 15 _The Rise and Fall of the Serbian Empire and the Extinction of Serbian Independence_, 1168–1496 From 1168 the power of the Serbs, or rather of the central Serb state of Raska, and the extent of its territory gradually but steadily increased. This was outwardly expressed in the firm establishment on the throne of the national Nemanja dynasty, which can claim the credit of having by its energy, skill, and good fortune fashioned the most imposing and formidable state the Serb race has ever known. This dynasty ruled the country uninterruptedly, but not without many quarrels, feuds, and rivalries amongst its various members, from 1168 until 1371, when it became extinct.