The king of the Bulgarians did not spare his allies any more than his enemies; he burnt and demolished all the cities that fell into his hands. He ruined the inhabitants, dragged them in his train like captives, and made them undergo, in addition to the calamities of war, all the outrages of a jealous and barbarous tyranny. The Greeks, who had solicited his assistance, were at last reduced to implore the aid of the Latins against the implacable fury of their allies. The Crusaders accepted with joy the alliance with the Greeks, whom they never ought to have repulsed, and re-entered into Adrianople. Didymatica, and most of the cities of Romania, shook off the intolerable yoke of the Bulgarians, and submitted to the Latins. The Greeks, whom Joannice had urged on to despair, showed some bravery, and became useful auxiliaries to the Latins; and the new empire might have hoped for a return of days of prosperity and glory, if so many calamities could possibly have been repaired by a few transient successes. But all the provinces were strewed with ruins, and the cities and countries were without inhabitants. The hordes of Mount Hemus, whether victorious or conquered, still continued their predatory habits. They easily recovered from their losses; the losses of the Franks became every day more irreparable. The leader of the Bulgarians sought out everywhere the foes of the new empire; and, being abandoned by the Greeks of Romania, he formed an alliance with Lascaris, the implacable enemy of the Latins. The pope in vain exhorted the nations of France and Italy to take up arms for the assistance of the conquerors of Byzantium; he could not awaken their enthusiasm for a cause that presented to its defenders nothing but certain evils, and dangers without glory.