Meanwhile Bosnia had been for nearly a hundred years enjoying a false security as an independent Serb kingdom. Its rulers had hitherto been known by the title of _Ban_, and were all vassals of the King of Hungary; but in 1377 Ban Tvrtko profited by the embarrassments of his suzerain in Poland and proclaimed himself king, the neighbouring kingdom of Serbia having, after 1371, ceased to exist, and was duly crowned in Saint Sava’s monastery of Mileševo. The internal history of the kingdom was even more turbulent than had been that of Serbia. To the endemic troubles of succession and alternating alliances and wars with foreign powers were added those of confession. Bosnia was always a no man’s land as regards religion; it was where the Eastern and Western Churches met, and consequently the rivalry between them there was always, as it is now, intense and bitter. The Bogomil heresy, too, early took root in Bosnia and became extremely popular; it was the obvious refuge for those who did not care to become involved in the strife of the Churches. One of the kings of Bosnia, Stephen Thomas, who reigned from 1444 till 1461, was himself a Bogomil, and when at the insistence of the Pope and of the King of Hungary, whose friendship he was anxious to retain, he renounced his heresy, became ostensibly a Roman Catholic, and began to persecute the Bogomils, he brought about a revolution. The rebels fled to the south of Bosnia, to the lands of one Stephen, who sheltered them, proclaimed his independence of Bosnia, and on the strength of the fact that Saint Sava’s monastery of Mileševo was in his territory, announced himself Herzog, or Duke (in Serbian Herceg, though the real Serb equivalent is _Vojvoda_) of Saint Sava, ever since when (1448) that territory has been called Hercegovina. In spite of many promises, neither the Pope nor the King of Hungary did anything to help Bosnia when the Turks began to invade the country after their final subjection of Serbia in 1459. In 1463 they invaded Bosnia and pursued, captured, and slew the last king; their conquest of the country was complete and rapid. A great exodus of the Serb population took place to the south, west, and north; but large numbers, especially of the landowning class, embraced the faith of their conquerors in order to retain possession of their property. In 1482 a similar fate befell Hercegovina. Albania had already been conquered after stubborn resistance in 1478. There remained only the mountainous coastal province of Zeta, which had been an independent principality ever since 1371. Just as inland Serbia had perished between the Turkish hammer and the Hungarian anvil, so maritime Serbia was crushed between Turkey and Venice, only its insignificance and inaccessibility giving it a longer lease of independent life. Ivan Crnojević, one of the last independent rulers of Zeta, who had to fly to Italy in 1480, abandoning his capital, Žabljak, to the Turks, returned in 1481, when the death of