Gediminas was a Grand Duke of Lithuania who ruled from around 1316 to 1341. He is known for founding the city of Vilnius, which later became the capital of Lithuania. Under his leadership, the Grand Duchy expanded its territory and strengthened its influence in the region. Gediminas is also recognized for promoting trade and cultural ties with neighboring countries. He established diplomatic relations with various states, including Poland and Moscow. His legacy is significant in Lithuanian history, as he laid the groundwork for the future development of the Grand Duchy.