Duchy of Lithuania Duchy of Lithuania Duchy of Lithuania (; ) was a state-territorial formation of ethnic Lithuanians, that existed from the 13th century until 1413. Most of the time it was a constituent part and a nucleus of the Grand Duchy of Lithuania. Other alternative names of the territorial formation, used in different periods, were Aukštaitija or Land of Lithuania (13th century), Duchy of Vilnius (14th – early 15th centuries), Lithuania Propria or simply Lithuania (in a narrow sense). The formation emerged in the central and eastern part of the present-day Lithuania, known as Aukštaitija, as the Lietuva Land (). It is
History of the Jews in Lithuania the lands between the Baltic and Black Seas that would become part of the Grand Duchy of Lithuania. The later and much larger stream of immigration originated in the 12th century and received an impetus from the persecution of the German Jews by the Crusaders. The traditional language of the vast majority of Jews of Lithuania, Yiddish, is based largely upon the Medieval German spoken by the western Germanic Jewish immigrants. The peculiar conditions that prevailed in Lithuania compelled the first Jewish settlers to adopt a different mode of life from that followed by their western co-religionists. In Lithuania of