The Knights of the order had been called in by King Andrew II of Hungary to settle and stabilize the eastern Hungarian frontier and protect it against the Cumans. 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 immune to fees and duties and could enforce their own justice. 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.