 Lithuanians are an indigenous people of the territories of north-eastern Podlaskie Voivodeship in Poland, being the descendants of the various Baltic tribes of the region (Yotvingians), which merged into the Lithuanian ethnicity in the Middle Ages.Poland first acquired its Lithuanian minority after the Union of Lublin in 1569, which transferred the administration of the historical Podlaskie Voivodeship from the Grand Duchy of Lithuania to the Polish Crown (both entities then formed a larger, federated state, the Polish-Lithuanian Commonwealth).During the next two centuries, the Lithuanian minority, faced with the dominant Polish culture in the region, was subject to Polonization.