The advancing Turk began raiding Bosnia and employed Serbian troops. The Ragusa archives record: "In January 1398, the son of Bajazet, with a great number of Turks and Slavs, entered Bosnia." Stefan Ostoja was now King of Bosnia, but he too seems to have been more intent upon annexing Ragusa than in organizing defence against the Turk. Nor can we stop to unravel the complicated series of quarrels of one Slav prince with another, of their intrigues with Venice, with Hungary, with Ragusa, each playing for his own hand, though the Turks were now established as near as Uskub, and in 1415 invaded Bosnia for the third time. Sigismund, King of Hungary, alone of the neighbouring princes, realized the gravity of the situation and sent an army against the Turks, only to find that the Herzegovina sided with the Turks against him. As a result, we learn from the Ragusa archives, "the whole of Bosnia is laid waste and the barons are preparing to exterminate each other." Venice meanwhile crept down the coast and occupied much of Dalmatia, while the South Slavs fought each other. Nationality is the craze of to-day. Religion, in the Middle Ages, played a similar part. Catholic, Orthodox, and Bogumil, hated each other more than they hated the less known Turk. Each was willing to use him against the other. People of the same race and language then fought each other because they differed about religion. To-day, even holding the same religious views, they fight in the sacred name of nationality. But then, as now, there were a few people who recognized the folly of the fashionable differences. At the Council of Basel in 1431 an effort was made to induce the Balkan chiefs, Catholic, Orthodox and even Bogumil, to send delegates to Basel with a view to ending religious strife and opposing a united front to the Turk. It was vain. The King of Bosnia, and Stefan, Despot of Serbia, declared war on each other and fought for several years. And Sandalj, Lord of the Herzegovina, sided with the Serbs and bought of the Sultan the right to take Bosnia. They failed to do so, but their efforts certainly helped the final destruction of Slav independence. Sandalj's successor, Stefan Kosatch, assumed the title Duke of Sava (whence "Herzegovina" the Duchy), became Bogumil and consequently fought both the Orthodox of Serbia and the Catholics of Ragusa. And ever the Turk advanced slowly and always found a Slav chief ready to side with him against a neighbour. At Fotcha, in the Herzegovina, I bought a bracelet of a silversmith, who related that his ancestor was the man who had guided the Turks into the district. Constantinople fell in 1453, and left the Sultan free to complete the conquest of the Balkans. The Hungarians, led by the great Hunyadi, opposed him. But the Orthodox Serbs, led by their Despot George Brankovitch, whose ancestor had deserted to the Turks at Kosovo, hated Catholicism more than Islam, and sided with the Turk against Hunyadi.