(Sachsen-Coburg) is a historical state in today's Bavaria
. It was part of the Duchy of Saxe-Coburg-Eisenach
after the Division of Erfurt
in 1572. In 1596 Saxe-Coburg-Eisenach was split, Johann Casimir got Saxe-Coburg and Johann Ernst got Saxe-Eisenach
. When Casimir died in 1633, his brother Ernst of Saxe-Eisenach ruled in Personal Union over Saxe-Coburg until he died in 1638. Saxe-Coburg was then given to other Ernestine duchies.
It became again a duchy in 1681. It remained under this name until 1699, when Albrecht of Saxe-Coburg died without sons. His brother Johann Ernst of Saxe-Saalfeld became the new Duke of Coburg and the duchy was renamed into Saxe-Coburg-Saalfeld in 1735.