Duke Ernst I of Saxe-Altenburg was a German nobleman born on December 25, 1826. He became the Duke of Saxe-Altenburg in 1850 and ruled until his death in 1908. His reign was marked by efforts to modernize the duchy and improve its infrastructure, including education and transportation. Ernst I was a member of the House of Saxe-Altenburg, a branch of the larger House of Wettin. He was known for his interest in the arts and sciences, supporting various cultural initiatives during his time as duke. His legacy includes contributions to the development of the region and its cultural heritage.