Frederick III, Duke of Saxe-Gotha-Altenburg, was a duke of Saxe-Gotha-Altenburg. Wikipedia
Born: April 14, 1699, Gotha, Germany
Died: March 10, 1772 (age 72 years), Gotha, Germany
Great-grandparents: Ernest I, Duke of Saxe-Gotha, Princess Elisabeth Sophie of Saxe-Altenburg, Augustus, Duke of Saxe-Weissenfels, and more
Great grandchild: Princess Louise of Saxe Gotha Altenburg