Frederick I, Duke of Saxe-Gotha-Altenburg, was a territorial ruler in Thuringia from the Ernestine branch of the House of Wettin. He continued the line of Saxe-Gotha founded by Ernest I, his father, which, to distinguish it from the older Gotha line, is generally referred to as Saxe-Gotha-Altenburg.
- Occupation
- aristocrat
- Citizenship
- Germany
- Born
- June 15, 1646, July 15, 1646
- Died
- August 2, 1691