but scarce had Coloman and his crusaders left the land when his work was undone and heresy was as vigorous as ever. In 1240 Ninoslav appears again as Ban, visiting Ragusa with a splendid retinue to renew the old treaty of trade and alliance. King Bela’s energies, in fact, were just then turned in another direction, for Assan, the Bulgarian prince, had declared in favor of the Greeks; his people therefore were denounced as heretics and schismatics, and Bela was stimulated to undertake a crusade against him, for which, as usual, Holy Land indulgences were promised. It was hard to make head at once against so many enemies of the faith, and in the confusion the Cathari of Bosnia had a respite. Still more important for them as a preventive of persecution was the Tartar invasion which, in 1241, reduced Hungary to a desert. In the bloody day of Flusse Sajo the Hungarian army was destroyed, Bela barely escaped with his life, and Coloman was slain. The respite was but temporary, however, for in 1244 Bela again overran Bosnia. Ninoslav made his peace and the heretics were persecuted, until 1246, when Hungary was involved in war with Austria, and promptly they rose again with Ninoslav at their head.[331] All these endeavors to diffuse the blessings of Christianity had not been made without bloodshed. We have few details of these obscure struggles in a land little removed from barbarism, but there is one document extant which shows that the Albigensian crusades, with all their horrors, had been repeated to no purpose. In 1247 Innocent IV., in making over the see of Bosnia to the Archbishop of Kalocsa, alludes to the labors performed by him and his predecessors in the effort to redeem it from heresy. They had meritoriously devastated the greater part of the land; they had carried away into captivity many thousands of heretics, with great effusion of blood, and no little slaughter of their own men and waste of their substance. In spite of these sacrifices, as the churches and castles which they had built were not strong enough to resist siege, the land could not be retained in the faith; it had wholly relapsed into heresy, and there was no hope of its voluntary redemption. The church of Kalocsa had been thoroughly exhausted, and it was now rewarded by placing the recalcitrant region under its jurisdiction, in the expectation that some future crusade might be more fortunate. Innocent IV. had, a few months earlier, ordered Bela to undertake a decisive struggle with the Cathari, but Ninoslav appealed to him, protesting that he had been since his conversion a faithful son of the Church, and had only accepted the aid of the heretics because it was necessary to preserve the independence of the Banate. Moved by this, Innocent instructed the Archbishop of Kalocsa to abstain from further persecution. He ordered an investigation into the faith and actions of Ninoslav, and gave permission to use the Glagolitic writing and the