Temporary capital of Lithuania during the invasion of Poland, to Lithuania according to the Soviet–Lithuanian Mutual Assistance Treaty. Since then Vilnius has been the capital of the Lithuanian SSR and then independent Lithuania. Lithuania refused to have diplomatic relations between Poland and Lithuania until the ultimatum of 1938. Railroad traffic, telegraph lines or even mail could not cross the Polish–Lithuanian border. Lithuania continued to declare Vilnius as its capital in all official documents, including the constitution. Since the city was controlled by Poland, all Lithuanian authorities were transferred to the city of Kaunas, which became the seat of the government. To reconcile reality with
Grand Duchy of Lithuania Skirmuntt, Mykolas Römeris (Michał Pius Römer), Józef Albin Herbaczewski (Juozapas Albinas Herbačiauskas), Józef Mackiewicz and Stanisław Mackiewicz. This feeling was expressed in poetry by Czesław Miłosz. Grand Duchy of Lithuania The Grand Duchy of Lithuania was a European state that lasted from the 13th century to 1795, when the territory was partitioned among the Russian Empire, the Kingdom of Prussia and Austria. The state was founded by the Lithuanians, one of the polytheistic Baltic tribes from Aukštaitija. The Grand Duchy expanded to include large portions of the former Kievan Rus' and other Slavic lands, including what is now Belarus and