In 1234 the order received into its ranks Conrad, Landgrave of Thuringia and Hesse, a man who had led a wicked and violent life, but, being brought to see his errors, made an edifying repentance, and became a Teutonic Knight, and afterward was elected grand master. This Conrad was brother to Louis of Thuringia, who was the husband of St. Elizabeth of Hungary. After the death of Elizabeth, the hospital at Marburg, where she had passed the latter years of her widowhood in the care of the sick, was made over to the Teutonic Knights, and after her canonization a church was built to receive her remains, and placed under the care of the order. In 1240 the knights received an earnest petition from the Duke of Poland, for aid against the Turks, who were ravaging his dominions, and by the enormous multitude of their hosts were able to defeat any army he could bring into the field. The knights accepted the invitation, and took part in a series of bloody and obstinate battles, in which they lost many of their number. They had also a new enemy to encounter in the Duke of Pomerania, who had been their ally, but who now sided with the Prussians against them. In the war that ensued the Duke was defeated, several of his strongholds were taken, and he was obliged to sue for peace. A few years afterward, however (1243), the Duke recommenced hostilities, and with more success. Culm was besieged by him, and the greatest miseries were endured by the inhabitants, the slaughter being so great in the numerous conflicts before the walls that at last very few men remained. The Bishop even counselled the widows to marry their servants, that the population of the town might not become extinct. The war was continued for several years with varying fortune, till a peace was at last concluded, principally through the mediation of the Duke of Austria. About this time a disputed election caused a schism in the order, and two rival grand masters for several years divided the allegiance of the knights, till Henry de Hohenlohe was recognized by both sides as master. During his term of office successful war was carried on in Courland and other neighboring countries, which resulted in the spread of Christianity and the advance of the power of the order. At the same time, the Teutonic order took part in the crusades in Palestine, and shared with the Templars and Hospitalers the successes and reverses there. It would be tedious to enter upon all the details of the conflicts undertaken by the order against the Prussians and others; suffice it to say that the knights, though often defeated, steadily advanced their dominion, and secured its permanence by the erection of fortresses, the centres about which cities and towns ultimately arose. Among these were Dantzic, Koenigsberg, Elbing, Marienberg, and Thorn.