プルーセン
During the Middle Ages, the territory of what is now the Kaliningrad Oblast was inhabited by tribes of Old Prussians (Sambians) in the western part and by Lithuanians in the eastern part. The tribes were divided by the rivers Pregolya and Łyna. The Teutonic Knights conquered the region and established a monastic state. On the foundations of a destroyed Prussian settlement known as Tvanksta, the Order founded the city of Königsberg (modern Kaliningrad). Germans resettled the territory and assimilated the indigenous Old Prussians. The Lithuanian-inhabited areas became known as Lithuania Minor. The old Baltic languages became extinct around the 17th century, their speakers having been assimilated and Germanised.