question: Who is the maternal grandfather of Georg Albrecht Of Saxe-Weissenfels, Count Of Barby?
context: [["Johann Georg, Duke of Saxe-Weissenfels", ["Johann Georg, Duke of Saxe- Weissenfels( 13 July 1677, in Halle \u2013 16 March 1712, in Weissenfels), was a duke of Saxe- Weissenfels- Querfurt and a member of the House of Wettin.", "He was the third child and first surviving son of Johann Adolf I, Duke of Saxe- Weissenfels, by his first wife, Johanna Magdalena of Saxe- Altenburg."]], ["Georg Albrecht of Saxe-Weissenfels, Count of Barby", ["Georg Albrecht of Saxe-Weissenfels, Count of Barby (b. Dessau, 19 April 1695 \u2013 d. Barby, 12 June 1739), was a German prince of the House of Wettin and the last count of Barby.", "He was the sixth (but second surviving) son of Heinrich of Saxe-Weissenfels, Count of Barby, and Elisabeth Albertine of Anhalt-Dessau."]], ["Albrecht of Saxe-Weissenfels", ["Albrecht of Saxe- Weissenfels( 14 April 1659 in Halle \u2013 9 May 1692 in Leipzig), was a German prince of the House of Wettin.", "He was the fifth and youngest son of August, Duke of Saxe- Weissenfels, and his first wife, Anna Maria of Mecklenburg- Schwerin."]], ["Johanna Magdalene of Saxe-Weissenfels", ["Johanna Magdalene of Saxe- Weissenfels( 17 March 1708 \u2013 25 January 1760), was a Duchess consort of Courland.", "She married the Duke of Courland, Ferdinand Kettler, on 20 September 1730.", "She was the daughter of Johann Georg, Duke of Saxe- Weissenfels and Fredericka Elisabeth of Saxe- Eisenach.", "The marriage was childless."]], ["Christian, Duke of Saxe-Weissenfels", ["Christian, Duke of Saxe- Weissenfels( 23 February 1682 in Weissenfels \u2013 28 June 1736 in Sangerhausen), was a duke of Saxe- Weissenfels- Querfurt and member of the House of Wettin.", "He was the sixth( but second surviving) son of Johann Adolf I, Duke of Saxe- Weissenfels, and Johanna Magdalena of Saxe- Altenburg."]], ["Princess Elisabeth Albertine of Anhalt-Dessau", ["Elisabeth Albertine of Anhalt-Dessau (1 May 1665 - 5 October 1706), was a German noblewoman by birth Princess of Anhalt-Dessau as member of the House of Ascania and by marriage Duchess of Saxe-Weissenfels-Barby.", "Born in C\u00f6lln an der Spree, she was the fourth of ten children born from the marriage of John George II, Prince of Anhalt-Dessau and Henriette Catherine of Orange-Nassau.", "From her nine older and younger siblings, five survive adulthood: Henriette Amalie (by marriage Princess of Nassau-Dietz), Marie Eleonore (by marriage Princess Radziwi\u0142\u0142 and Duchess of Olyka), Henriette Agnes, Leopold I, Prince of Anhalt-Dessau and Johanna Charlotte (by marriage Margravine of Brandenburg-Schwedt)."]], ["Magdalena Sibylla of Saxe-Weissenfels (1673\u20131726)", ["Magdalene Sibylle of Saxe- Weissenfels", "( 3 September 1673 \u2013 28 November 1726), was a German noblewoman member of the House of Wettin( Albertine line) and by marriage Duchess of Saxe- Eisenach.", "Born in Halle, she was the oldest daughter and first child of Duke Johann Adolf I of Saxe- Weissenfels and his wife Johanna Magdalena, the daughter of Duke Frederick William II of Saxe- Altenburg.", "She was named after her paternal great- grandmother, Duchess Magdalene Sibylle of Prussia."]], ["Johann Adolf II, Duke of Saxe-Weissenfels", ["Johann Adolf II, Duke of Saxe- Weissenfels", "( Weissenfels, 4 September 1685 \u2013 Leipzig, 16 May 1746), was the last duke of Saxe- Weissenfels- Querfurt and a member of the House of Wettin.", "He was also a commander in the Saxon army.", "Johann Adolf was the youngest of the eleven children of Johann Adolf I, Duke of Saxe- Weissenfels, and Johanna Magdalena of Saxe- Altenburg.", "His mother died five months after his birth, on 22 January 1686."]], ["Frederick, Duke of Saxe-Weissenfels-Dahme", ["Frederick of Saxe- Weissenfels(\" Frederick Erdmann\"; b. Halle, 20 November", "1673- d. Dahme, 16 April 1715), was a German prince member of the House of Wettin and Duke of Saxe- Weissenfels- Dahme.", "He was the sixth son of Augustus, Duke of Saxe- Weissenfels but first- born from his second marriage with Johanna Walpurgis of Leiningen- Westerburg."]], ["Johann Adolf I, Duke of Saxe-Weissenfels", ["Johann Adolf I, Duke of Saxe- Weissenfels( 2 November 1649, in Halle \u2013 24 May 1697, in Weissenfels), was a duke of Saxe- Weissenfels- Querfurt and member of the House of Wettin.", "He was the first son of Augustus, Duke of Saxe- Weissenfels, and his first wife, Anna Maria of Mecklenburg- Schwerin."]]]
supporting_facts: [["Georg Albrecht of Saxe-Weissenfels, Count of Barby", 1], ["Princess Elisabeth Albertine of Anhalt-Dessau", 1]]
evidences: [["Georg Albrecht of Saxe-Weissenfels", "mother", "Elisabeth Albertine of Anhalt-Dessau"], ["Elisabeth Albertine of Anhalt-Dessau", "father", "John George II"]]
answer: John George II