But the Duke of Bohemia, encouraged by Rostislav, still held out against the Carlovingian form of Christianity; the Moravians defeated Louis in 849, and Rostislav strengthened his own position as the champion of Slavonic independence by an alliance with the Bulgarians. This alliance was to produce results very unexpected at the time by Rostislav, and powerfully affecting the future of Moravia and Bohemia. Boris, the powerful king of Bulgaria, had received at his Court a Christian monk named Methodius, the son of a patrician of Thessalonica. Apparently Methodius had originally been brought to the Bulgarian Court on account of his artistic talent; but he was also a very zealous Christian; and when Boris ordered him to paint such a picture, in the hall of his palace, as would strike terror into all who saw it, Methodius improved the occasion by painting a picture of the Last Judgment. The inquiries and explanations that followed prepared the way for the acceptance of the new faith by the king of Bulgaria and his subjects. [Illustration: LIBUS̆A’S BATH JUST BELOW THE VYS̆EHRAD.] But the Greek missionaries found that the want of a written language prevented them from giving their Slavonic converts full instruction in the details of the Christian creed. Methodius, therefore, called in the help of his brother Cyril, who had been occupied in the conversion of the Chazars, a people whose country lay a little to the north of the Bulgarian kingdom. Cyril was a learned monk, who had been trained at the Court of Constantinople, and was well skilled in various languages. Taking the Greek alphabet as his basis, but altering its form, he invented a written language for the Slavonic race, into which he translated a liturgy, several books of the Bible, and some of the early Fathers. The news of the conversion of the Bulgarians quickly came to the ears of Rostislav, for the great Bulgarian kingdom touched the eastern side of Moravia; and the recent alliance had brought the two peoples into closer intercourse. Unwelcome as Christianity had seemed to the Moravians, when presented to them as a demand of Frankish invaders, and taught in an unknown tongue, its lessons came with a very different force when urged by pious and peaceable monks, recommended by friendly kinsmen, and expounded in a language intelligible to the converts. Rostislav no doubt quickly perceived that the new teaching might form a valuable link in the alliance of the Slavs against their enemies. He appealed to the Emperor of the East to send Cyril and Methodius to Moravia; and, when they arrived at the town of Devina, Rostislav and his followers went out to welcome them; and after Cyril had retired from the mission, Methodius was recognised by the Pope as Archbishop of Moravia and Pannonia.