First conquered by the Teutonic Knights in the 14th century as part of a crusade to Christianise the country, by the 15th century Lithuania was a semi-autonomous grand Duchy within the Kingdom of Poland. After the partitions of Poland in 1795, the area was annexed by Russia. After World War I, the area became part of the restored Republic of Poland. The area was soon annexed by the Soviet Union, then by Nazi Germany during Operation Barbarossa, and did not finally regain its independence until...