Question: What is the date of death of Fredericka Elisabeth Of Saxe-Eisenach's father?
Answer: 19 September 1686

From her seven older and younger siblings four survive adulthood: Eleonore Erdmuthe Luise (by her two marriages Margravine of Brandenburg-Ansbach and Electress of Saxony), Frederick August, Hereditary Prince of Saxe-Eisenach, John George II, Duke of Saxe-Eisenach and John William, Duke of Saxe-Eisenach. Johann Georg I, Duke of Saxe-Eisenach (Weimar, 12 July 1634 – hunting accident, Eckhartshausen, Marksuhl, 19 September 1686). He was the fifth but third surviving son of Wilhelm, Duke of Saxe-Wei