The Brothers of Dobrin (Polish Bracia Dobrzyńscy) also known as Prussian Cavaliers of Jesus Christ and in Latin as Fratres Milites Christi (de Prussia, de Dobrin, de Mazovia), were a military order created by Christian , the bishop of Prussia (1216-1228), to protect Masovia (Polish Mazowsze) and Kujawy against raids from the pagan Prussians, in answer to the conquest attempts by Conrad of Masovia. In the same year the creation of the order was confirmed by Pope Gregory IX, and the independent Duke Conrad of Masovia (Polish Konrad I Mazowiecki) granted them the town of Dobrin (Polish Dobrzyń nad Wisłą) and surrounding Dobriner Land (Ziemia Dobrzyńska) territories, located south of and adjacent to Prussia. Brothers of Dobrin were the only military order created in Poland.
At first the order was composed of 15 knights from Lower Saxony and Mecklenburg, led by master Brunon . In the face of the order's lack of success in battle against the Prussians, as well as their small number (at its highest, 35 knights), around 1235 a majority of the Brothers of Dobrin; joined the Teutonic Order, as allowed by papal documents. In 1237 the rest of the Brothers were moved by Konrad Mazowiecki to Drohiczyn, to increase the military strength of that outpost. The last mention of the Brothers of Dobrin; recorded by history comes from 1240 when Drohiczyn was captured from Konrad by prince Danylo (Polish Daniel Halicki).
The Brothers of Dobrin; provided assistance to the Cistercian missionaries in Prussia and protection from the raids of the pagan Prussian tribes. Their ideology was represented by their clothing - over their armor they had white cloaks, with symbols of a red sword raised up and a red star representing the revelations of Jesus to pagans. The rules of their orders were based on those of Knights of the Sword and the Knights Templar.
