Vytautas the Great was a prominent leader of the Grand Duchy of Lithuania during the late 14th and early 15th centuries. He is best known for his efforts to expand and strengthen the duchy, making it one of the largest and most powerful states in Europe at the time. Vytautas played a crucial role in the Battle of Grunwald in 1410, where Lithuanian and Polish forces defeated the Teutonic Knights. Vytautas was also known for his diplomatic skills, forging alliances with neighboring countries and promoting religious tolerance. His reign marked a period of cultural and economic growth in Lithuania, and he is remembered as a national hero. His legacy continues to influence Lithuanian identity and history today.