Sigismund I the Old was a king of Poland and Grand Duke of Lithuania, reigning from 1506 to 1548. He was a member of the Jagiellonian dynasty and is known for his efforts to strengthen the Polish-Lithuanian Commonwealth. His reign was marked by significant cultural and economic development, as well as military campaigns to secure the borders of his realm. Sigismund I was also a patron of the arts and education, promoting the establishment of universities and supporting artists. His rule contributed to the flourishing of the Renaissance in Poland, making him a notable figure in the country's history.