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

Knowledge 1: Fredericka Elisabeth of Saxe-Eisenach
Fredericka Elisabeth of Saxe-Eisenach (5 May 1669 - 12 November 1730), was a German noblewoman member of the House of Wettin and by marriage Duchess of Saxe-Weissenfels.Born in Altenkirchen, she was the seventh of eight children born from the marriage of John George I, Duke of Saxe-Eisenach and Johannetta, Countess of Sayn-Wittgenstein-Sayn-Altenkirchen.From her seven older and younger siblingsfour 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. [SEP] Knowledge 2: John George I, 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-Weimar and Eleonore Dorothea of Anhalt-Dessau.After the death of his father (1662), his older brother Johann Ernst II inherited Weimar, and his second brother Adolf Wilhelm received Eisenach.Johann Georg received an income from the new duchy of Saxe-Eisenach and took his residence in the small town of Marksuhl.In 1668 his brother Adolf Wilhelm died.His fifth and only surviving son, Wilhelm August, was born eight days after his father's death and became duke from the moment of his birth; Johann George became the regent of the duchy and also the guardian of the new duke.Wilhelm August died in 1671 at only two years of age, and Johann Georg inherited the duchy.The next year (1672) the death without heirs of the Duke Frederick Wilhelm III of Saxe-Altenburg forced a new treaty of division of the family lands between Johann Georg, his surviving brothers and his cousin.Johann Georg was confirmed in his possession of Eisenach and took some towns, and his younger brother, Bernhard, inherited Jena.Johann Georg thus became the founder of the most recent line of the dukes of Saxe-Eisenach, who became extinct in 1741.He was ruler in 1685 when Johann Sebastian Bach was born in the duchy.
Knowledge 1: John George I, 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-Weimar and Eleonore Dorothea of Anhalt-Dessau.After the death of his father (1662), his older brother Johann Ernst II inherited Weimar, and his second brother Adolf Wilhelm received Eisenach.Johann Georg received an income from the new duchy of Saxe-Eisenach and took his residence in the small town of Marksuhl.In 1668 his brother Adolf Wilhelm died.His fifth and only surviving son, Wilhelm August, was born eight days after his father's death and became duke from the moment of his birth; Johann George became the regent of the duchy and also the guardian of the new duke.Wilhelm August died in 1671 at only two years of age, and Johann Georg inherited the duchy.The next year (1672) the death without heirs of the Duke Frederick Wilhelm III of Saxe-Altenburg forced a new treaty of division of the family lands between Johann Georg, his surviving brothers and his cousin.Johann Georg was confirmed in his possession of Eisenach and took some towns, and his younger brother, Bernhard, inherited Jena.Johann Georg thus became the founder of the most recent line of the dukes of Saxe-Eisenach, who became extinct in 1741.He was ruler in 1685 when Johann Sebastian Bach was born in the duchy. [SEP] Knowledge 2: Albert IV, Duke of Saxe-Eisenach
Albrecht, Duke of Saxe-Eisenach, (Altenburg, 27 July 1599 – Eisenach, 20 December 1644) was a ruler of the duchy of Saxe-Eisenach.He was the seventh (but fourth surviving) son of Johann, Duke of Saxe-Weimar, and Dorothea Maria of Anhalt.His regnal name Albert IV derives from the numbering of the duchy of Saxony as a whole, not specifically to the succession in Saxe-Eisenach.Albrecht received his first instruction from the Field Marshal Frederick of Kospoth.Later he studied at the University of Jena with his brothers.In the years 1619-1621 he completed his "Cavalierstour" (Study Tour) with his younger brother Johann Frederick.The two princes travelled to France and Switzerland.After his return in 1621, Albrecht occupied himself with administrative duties until 1626.He also represented his absent brothers as regent.In Weimar on 24 June 1633 Albrecht married Dorothea of Saxe-Altenburg, daughter of Frederick William I, Duke of Saxe-Weimar.The marriage was childless.In accordance with a divisionary treaty concluded with his brothers, Albrecht received Eisenach in 1640.He died four years later, after which his state was merged with Saxe-Weimar under Wilhelm of Saxe-Weimar.
Knowledge 1: Fredericka Elisabeth of Saxe-Eisenach
Fredericka Elisabeth of Saxe-Eisenach (5 May 1669 - 12 November 1730), was a German noblewoman member of the House of Wettin and by marriage Duchess of Saxe-Weissenfels.Born in Altenkirchen, she was the seventh of eight children born from the marriage of John George I, Duke of Saxe-Eisenach and Johannetta, Countess of Sayn-Wittgenstein-Sayn-Altenkirchen.From her seven older and younger siblingsfour 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. [SEP] Knowledge 2: Albert IV, Duke of Saxe-Eisenach
Albrecht, Duke of Saxe-Eisenach, (Altenburg, 27 July 1599 – Eisenach, 20 December 1644) was a ruler of the duchy of Saxe-Eisenach.He was the seventh (but fourth surviving) son of Johann, Duke of Saxe-Weimar, and Dorothea Maria of Anhalt.His regnal name Albert IV derives from the numbering of the duchy of Saxony as a whole, not specifically to the succession in Saxe-Eisenach.Albrecht received his first instruction from the Field Marshal Frederick of Kospoth.Later he studied at the University of Jena with his brothers.In the years 1619-1621 he completed his "Cavalierstour" (Study Tour) with his younger brother Johann Frederick.The two princes travelled to France and Switzerland.After his return in 1621, Albrecht occupied himself with administrative duties until 1626.He also represented his absent brothers as regent.In Weimar on 24 June 1633 Albrecht married Dorothea of Saxe-Altenburg, daughter of Frederick William I, Duke of Saxe-Weimar.The marriage was childless.In accordance with a divisionary treaty concluded with his brothers, Albrecht received Eisenach in 1640.He died four years later, after which his state was merged with Saxe-Weimar under Wilhelm of Saxe-Weimar.

Answer: 19 September 1686