Prussians were the native and main inhabitants of the lands which later became the core lands of the Teutonic Order. After conquest and conversion to Christianity, the Prussian nobility became vassals of the Order and Germanized. The officers of the Order ceased to speak in Prussian with local inhabitants in 1309. After the extinction of the Order and the spread of the Reformation of the church, the lot of Prussians became somewhat better. Three Reformed catechisms in the Prussian language were published between 1545 and 1561.