[2] The Bartians, along with the other Prussians, were conquered by the Teutonic Knights, who Christianized them under duress, brought in settlers.

Several years of conquest attempts by Poland, aided by a number of crusades by the popes and by Konrad of Masovia, had been fairly successfully repelled by the Prussians.

Then Konrad of Masovia called for further crusades and invited the Teutonic Knights, an Order of the Catholic Church, to settle in Chełmno Land in 1226.

Receiving support from the rest of Christian Europe, the military order was able to expand their territory northeast.

[1] During the Great Prussian Uprising (1260–1274), that started after the Knights suffered a major loss in the Battle of Durbe, Bartians chose Diwane as their leader.

With help from other Prussian tribes, Diwane attacked Kulm (Chełmno), Marienburg (Malbork), and Christburg (Dzierzgoń).