List of rulers of Lithuania
The state of Lithuania formed in the 1230s, when threatened by the Livonian Order in the north and the Teutonic Knights in the west, the Baltic tribes united under the leadership of Mindaugas. He became the only crowned king of Lithuania. His state became known as Grand Duchy of Lithuania. After Grand Duke Jogaila became also king of Poland in 1386, the two states became closer connected and since 1440 both were ruled by a common ruler. In 1569 Union of Lublin was signed and a new entity—the Polish–Lithuanian Commonwealth—emerged. The commonwealth was partitioned in 1795 and Lithuania became part of the Russian Empire till 16 February 1918. The Council of Lithuania was able to establish the sovereignty only in 1919, after Germany lost World War I. The first republic of Lithuania existed until 1940 when it was occupied by the Soviet Union. During the Soviet-German War, Lithuania was occupied by Nazi Germany. In 1944, as Germany was losing the war, Russia re-occupied Lithuania and established the Lithuanian Soviet Socialist Republic. On 11 March 1990, Lithuania became the first Soviet republic to declare independence. The restored Republic of Lithuania is a democratic republic, a member of both the European Union and NATO.
History of Lithuania
The first humans arrived on the territory of modern Lithuania in the 10th millennium BC after the glaciers receded at the end of the last glacial period. According to the historian Marija Gimbutas, these people came from two directions: the Jutland Peninsula and from present-day Poland. They brought two different cultures, as evidenced by the tools they used. They were traveling hunters and did not form stable settlements. In the 8th millennium BC, the climate became much warmer, and forests developed. The inhabitants of what is now Lithuania then traveled less and engaged in local hunting, gathering and fresh-water fishing. During the 6th–5th millennium BC, various animals were domesticated and dwellings became more sophisticated in order to shelter larger families. Agriculture did not emerge until the 3rd millennium BC due to a harsh climate and terrain and a lack of suitable tools to cultivate the land. Crafts and trade also started to form at this time. 
Speakers of North-Western Indo-European might have arrived with the Corded Ware culture around 3200/3100 BC.