Input (grade 12): After the Division of Erfurt in 1572, Coburg was part of the Duchy of Saxe-Coburg-Eisenach, ruled by the Ernestine duke John Casimir jointly with his brother John Ernest.
Output (grade 8): It was part of the Duchy of Saxe-Coburg-Eisenach after the Division of Erfurt in 1572.