In 1337 the Emperor Louis IV granted to the Order the imperial privilege of the conquest of Lithuania and Russia. Shortly after being chosen as Grand Master, Heinrich Dusemer von Arfberg attacked the Grand Duchy of Lithuania. The campaign resulted in the total defeat of the Lithuanian army at the Battle of the Strëva on 2 February 1348. But the Teutonic Knights did not profit long from their victory. The black plague which has reached Prussia forces them to leave the conquered country. In 1386, the Grand Duke of Lithuania Jogaila converted to Catholicism and was baptized under the name Ladislas Władysław. By his marriage to Queen Hedwig of Anjou, he was crowned king of Poland. The personal union of the two countries creates a potentially formidable opponent for the Teutonic Knights. In 1398, under the command of Konrad von Jungingen, the armies of the Order destroyed Visby and defeated the Vitalians in wintering on the island of Gotland. From then on, the Baltic Sea is no longer criss-crossed by pirate raids. The most famous of them, known as the Red Corsair, Klaus Störtebeker himself prefers to take refuge in the North Sea. Marguerite I of Denmark and Albert of Sweden ceded the island as a fief to the Teutonic Knights. In the same year, by the treaty of Salynas, Vytautas the Great yielded to him the duchy of Samogitia. In 1402 he bought the New Mark of Brandenburg for 63,200 Hungarian florins. In East Prussia, many towns and villages are founded or developed, such as Sensburg (today: Mrągowo) where since 1348 the knights had a wooden fortress.
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