Kingdom of Lithuania (1918)
The Kingdom of Lithuania was a short-lived constitutional monarchy created towards the end of World War I when Lithuania was under occupation by the German Empire. The Council of Lithuania declared Lithuania's independence on February 16, 1918, but the Council was unable to form a government, police, or other state institutions due to the continued presence of German troops. The Germans presented various proposals to incorporate Lithuania into the German Empire, particularly Prussia. The Lithuanians resisted this idea and hoped to preserve their independence by creating a separate constitutional monarchy. On June 4, 1918, they voted to offer the Lithuanian throne to the German noble Wilhelm, 2nd Duke of Urach. Duke Wilhelm accepted the offer in July 1918 and took the name Mindaugas II. However, he never visited Lithuania. His election stirred up controversy, divided the Council, and did not achieve the desired results. As Germany was losing the war and was engulfed in the German Revolution, Lithuania suspended its decision to invite Duke William on November 2, 1918, thereby ending his short reign.
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.