Ernest I, Duke of Saxe-Gotha-Altenburg was a German nobleman born on December 25, 1601. He became the Duke of Saxe-Gotha-Altenburg in 1640 and ruled until his death in 1675. Ernest was known for his efforts to promote education and culture in his duchy, establishing schools and supporting the arts. During his reign, Ernest I also focused on strengthening the economy of his territory. He worked to improve agricultural practices and foster trade, which helped enhance the prosperity of Saxe-Gotha-Altenburg. His leadership contributed to the stability and development of the region during a challenging period in European history.