Prehistoric
The first people settled in the territory of Lithuania after the last glacial period in the 10th millennium BC. Over a millennium, the Proto-Indo-Europeans, who arrived in the 3rd – 2nd millennium BC, mixed with the local population and formed various Baltic tribes. The first written mention of Lithuania is found in a medieval German manuscript, the Annals of Quedlinburg, in an entry dated 9 March 1009.
Medieval
Initially inhabited by fragmented Baltic tribes, in the 1230s the Lithuanian lands were united by Mindaugas, who was crowned as King of Lithuania on 6 July 1253. After his assassination in 1263, pagan Lithuania was a target of the Christian crusades of the Teutonic Knights and the Livonian Order. Despite the devastating century-long struggle with the Orders, the Grand Duchy of Lithuania expanded rapidly, overtaking former Slavic principalities of Kievan Rus'.
By the end of the 14th century, Lithuania was one of the largest countries in Europe and included present-day Belarus, Ukraine, and parts of Poland and Russia. The geopolitical situation between the west and the east determined the multicultural and multi-confessional character of the Grand Duchy of Lithuania. The ruling elite practiced religious tolerance and borrowed Chancery Slavonic language as an auxiliary language to the Latin for official documents.
In 1385, the Grand Duke Jogaila accepted Poland's offer to become its king. Jogaila embarked on gradual christianization of Lithuania and established a personal union between Poland and Lithuania. It implied that Lithuania, the fiercely independent land, was one of the last pagan areas of Europe to adopt Christianity.
After two civil wars, Vytautas the Great became the Grand Duke of Lithuania in 1392. During his reign, Lithuania reached the peak of its territorial expansion, centralization of the state was begun, and the Lithuanian nobility became increasingly prominent in state
