structural:expansion, information:classification
Transylvania, Kingdom of Hungary

In 1211, Andrew II of Hungary accepted the services of the Teutonic Knights and granted them the district of Burzenland in Transylvania, where they would be exempt from fees and duties and could administer their own justice. Andrew had been involved in negotiations for the marriage of his daughter with the son of Hermann, Landgrave of Thuringia, whose vassals included the family of Hermann von Salza. Led by a brother called Theoderich or Dietrich, the Order defended the south-eastern borders of the Kingdom of Hungary against the neighbouring Cumans. Many forts of wood and mud were built for defence. They settled new German peasants among the existing Transylvanian Saxon inhabitants. The Cumans had no fixed settlements for resistance, and soon the Teutons were expanding into their territory. By 1220, the Teutonics Knights had built five castles, some of them made of stone. Their rapid expansion made the Hungarian nobility and clergy, who were previously uninterested in those regions, jealous and suspicious. Some nobles claimed these lands, but the Order refused to share them, ignoring the demands of the local bishop.

After the Fifth Crusade, King Andrew returned to Hungary and found his kingdom full of resentment because of the expenses and losses of the failed military campaign. When the nobles demanded that he cancel the concessions made to the Knights, he concluded that they had exceeded their task and that the agreement should be revised, but did not revert the concessions. However, Prince Béla, heir to the throne, was allied with the nobility. In 1224, the Teutonic Knights, seeing that they would have problems when the Prince inherited the Kingdom, petitioned Pope Honorius III to be placed directly under the authority of the Papal See, rather than that of the King of Hungary. This was a grave mistake, as King Andrew, angered and alarmed at their growing power, responded in 1225 by expelling the Teutonic Knights, although he allowed the ethnically German commoners and peasants settled here by the Order to remain and these became part of the larger group of the Transylvanian Saxons. Lacking the military organization and experience of the Teutonic Knights, the Hungarians failed to replace them with adequate defence against the attacking Cumans. Soon, the steppe warriors would be a threat again.