what is the history of this place he was a duke of?
The first settlement occurred after the last glacial period in the 10th millennium BC.
Lithuania
The first people settled in the territory of Lithuania after the last glacial period in the 10th millennium BC: Kunda, Neman and Narva cultures. 
what is family of gediminas? A group of family members of Gediminas, Grand Duke of Lithuania. what are its origins? Various theories have claimed that Gediminas was either his predecessor Grand Duke Vytenis' son, his brother, his cousin, or his hostler. what is the origin of this former mentioned predecessor? UNANSWERABLE what are its wives? The Bychowiec Chronicle mentions three wives: Vida, Olga , and Jewna. who is the last mentioned wife? She was the daughter of Prince Ivan. who are the sons? Eight sons: Jaunutis, Kęstutis,  Algirdas and others. who is the first mentioned son? He was the Grand Duke of Lithuania.
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Lithuania [SEP] History
The first people settled in the territory of Lithuania after the last glacial period in the 10th millennium BC: Kunda, Neman and Narva cultures. 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 travelled less and engaged in local hunting, gathering and fresh-water fishing. 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.