question: When did Philipp, Duke Of Saxe-Merseburg-Lauchstädt's father die?
context: [["Sophie Hedwig of Saxe-Merseburg", ["Sophie Hedwig of Saxe-Merseburg (4 August 1660 - 2 August 1686), was a German noblewoman member of the House of Wettin and by marriage Duchess of Saxe-Saalfeld.", "Born in Merseburg, she was a child of Christian I, Duke of Saxe-Merseburg and his wife Christiana of Schleswig-Holstein-Sonderburg-Gl\u00fccksburg."]], ["Heinrich, Duke of Saxe-Merseburg", ["Heinrich, Duke of Saxe-Merseburg (Merseburg, 2 September 1661 \u2013 Doberlug, 28 July 1738), was a duke of Saxe-Merseburg and member of the House of Wettin.", "He was the sixth (but fourth surviving) son of Christian I, Duke of Saxe-Merseburg and Christiana of Schleswig-Holstein-Sonderburg-Gl\u00fccksburg."]], ["Christiane of Saxe-Merseburg", ["Christiane of Saxe- Merseburg( 1 June 1659 \u2013 13 March 1679), was a German noblewoman member of the House of Wettin and by marriage Duchess of Saxe- Gotha- Altenburg.", "Born in Merseburg, she was a child of Christian I, Duke of Saxe- Merseburg and his wife Christiana of Schleswig- Holstein- Sonderburg- Gl\u00fccksburg."]], ["Eleonore Sophie of Saxe-Weimar", ["Eleonore Sophie of Saxe- Weimar( 22 March 1660 \u2013 4 February 1687), was a German noblewoman member of the House of Wettin and by marriage Duchess of Saxe- Merseburg- Lauchst\u00e4dt.", "Born in Weimar, she was the third of five children born from the marriage of John Ernest II, Duke of Saxe- Weimar and Christine Elisabeth of Schleswig- Holstein- Sonderburg."]], ["August, Duke of Saxe-Merseburg-Z\u00f6rbig", ["August, Duke of Saxe-Merseburg-Z\u00f6rbig (Merseburg, 15 February 1655 \u2013 Z\u00f6rbig, 27 March 1715), was a German prince and member of the House of Wettin.", "He was the third but second surviving son of Christian I, Duke of Saxe-Merseburg and Christiana of Schleswig-Holstein-Sonderburg-Gl\u00fccksburg."]], ["Maurice Wilhelm, Duke of Saxe-Merseburg", ["Maurice Wilhelm, Duke of Saxe-Merseburg (5 February 1688 \u2013 21 April 1731) was a duke of Saxe-Merseburg and member of the House of Wettin.", "He was born in Merseburg, the fifth (but second surviving) son of Christian II, Duke of Saxe-Merseburg, and Erdmuthe Dorothea of Saxe-Zeitz."]], ["Philipp, Duke of Saxe-Merseburg-Lauchst\u00e4dt", ["Philipp, Duke of Saxe-Merseburg-Lauchst\u00e4dt (26 October 1657 \u2013 1 July 1690) was a German prince.", "He was a member of the House of Wettin.", "He was born in Merseburg, the fifth but third surviving son of Christian I, Duke of Saxe-Merseburg and Christiana of Schleswig-Holstein-Sonderburg-Gl\u00fccksburg."]], ["Christian II, Duke of Saxe-Merseburg", ["Christian II of Saxe- Merseburg( 19 November 1653 \u2013 20 October 1694), was a duke of Saxe- Merseburg and member of the House of Wettin.", "He was the second( but eldest surviving) son of Christian I, Duke of Saxe- Merseburg, and Christiana of Schleswig- Holstein- Sonderburg- Gl\u00fccksburg."]], ["Christian I, Duke of Saxe-Merseburg", ["Christian I of Saxe-Merseburg (Dresden, 27 October 1615 \u2013 Merseburg, 18 October 1691), was the first duke of Saxe-Merseburg and a member of the House of Wettin.", "He was the sixth (third surviving) son of Johann Georg I, Elector of Saxony, and his second wife Magdalene Sibylle of Prussia."]], ["Christian III Maurice, Duke of Saxe-Merseburg", ["Christian III Maurice, Duke of Saxe-Merseburg (Merseburg, 7 November 1680 \u2013 Merseburg, 14 November 1694), was a duke of Saxe-Merseburg and member of the House of Wettin.", "He was the eldest son of Christian II, Duke of Saxe-Merseburg, and Erdmuthe Dorothea of Saxe-Zeitz."]]]
supporting_facts: [["Philipp, Duke of Saxe-Merseburg-Lauchst\u00e4dt", 2], ["Christian I, Duke of Saxe-Merseburg", 0]]
evidences: [["Philipp, Duke of Saxe-Merseburg-Lauchst\u00e4dt", "father", "Christian I, Duke of Saxe-Merseburg"], ["Christian I, Duke of Saxe-Merseburg", "date of death", "18 October 1691"]]
answer: 18 October 1691