Question: Who is the maternal grandfather of Sophie Of Württemberg, Duchess Of Saxe-Weimar?

Knowledge 1: Sophie of Württemberg, Duchess of Saxe-Weimar
Sophie of Württemberg (20 November 1563 - 21 July 1590), was a German noblewoman member of the House of Württemberg and by marriage Duchess of Saxe-Weimar.Born in Stuttgart, she was the youngest of twelve children born from the marriage of Christoph, Duke of Württemberg and Anna Maria of Brandenburg-Ansbach.From her eleven older siblings, nine survive adulthood: Eberhard, Hereditary Prince of Württemberg, Hedwig (by marriage Landgravine of Hesse-Marburg),Elisabeth (by her two marriages Countess of Henneberg-Schleusingen and Countess Palatine of Veldenz-Lauterecken), Sabine (by marriage Landgravine of Hesse-Kassel), Emilie (by marriage Countess Palatine of Simmern-Sponheim), Eleonore (by her two marriages Princess of Anhalt and Landgravine of Hesse-Darmstadt), Louis III, Duke of Württemberg, Dorothea Maria (by marriage Countess Palatine of Sulzbach) and Anna (by her two marriages Duchess of Oława and Legnica). [SEP] Knowledge 2: Anna Maria of Brandenburg-Ansbach
Anna Maria of Brandenburg-Ansbach (28 December 1526 – 20 May 1589) was a German princess of Brandenburg-Ansbach.Anna Maria was born at Jägerndorf, the eldest daughter of George, Margrave of Brandenburg-Ansbach and his second wife Hedwig of Münsterberg-Oels, daughter of Charles I of Münsterberg-Oels.Anna Maria was brought up as a Lutheran and on 24 February 1544 became the wife of Christoph, Duke of Württemberg.She later acted as guardian to her son Ludwig III, Duke of Württemberg early in his reign.After the death of her husband Christoph she lived more than 20 years in the Nürtingen castle, she died in Nürtingen.After losing both her husband and her eldest son in 1568, Anna Maria fell madly in love with the young Landgrave George I of Hesse-Darmstadt (1547–1596).Soon afterwards she became mentally confused and was locked up.George I later married her daughter Eleonore.She died in 1589 and was buried in the St. George's Collegiate Church in Tübingen.
Knowledge 1: Sophie of Württemberg, Duchess of Saxe-Weimar
Sophie of Württemberg (20 November 1563 - 21 July 1590), was a German noblewoman member of the House of Württemberg and by marriage Duchess of Saxe-Weimar.Born in Stuttgart, she was the youngest of twelve children born from the marriage of Christoph, Duke of Württemberg and Anna Maria of Brandenburg-Ansbach.From her eleven older siblings, nine survive adulthood: Eberhard, Hereditary Prince of Württemberg, Hedwig (by marriage Landgravine of Hesse-Marburg),Elisabeth (by her two marriages Countess of Henneberg-Schleusingen and Countess Palatine of Veldenz-Lauterecken), Sabine (by marriage Landgravine of Hesse-Kassel), Emilie (by marriage Countess Palatine of Simmern-Sponheim), Eleonore (by her two marriages Princess of Anhalt and Landgravine of Hesse-Darmstadt), Louis III, Duke of Württemberg, Dorothea Maria (by marriage Countess Palatine of Sulzbach) and Anna (by her two marriages Duchess of Oława and Legnica). [SEP] Knowledge 2: Christoph, Duke of Württemberg
Christoph of Württemberg, Duke of Württemberg (12 May 1515 – 28 December 1568) ruled as Duke of Württemberg from 1550 until his death in 1568.
Knowledge 1: Anna Maria of Brandenburg-Ansbach
Anna Maria of Brandenburg-Ansbach (28 December 1526 – 20 May 1589) was a German princess of Brandenburg-Ansbach.Anna Maria was born at Jägerndorf, the eldest daughter of George, Margrave of Brandenburg-Ansbach and his second wife Hedwig of Münsterberg-Oels, daughter of Charles I of Münsterberg-Oels.Anna Maria was brought up as a Lutheran and on 24 February 1544 became the wife of Christoph, Duke of Württemberg.She later acted as guardian to her son Ludwig III, Duke of Württemberg early in his reign.After the death of her husband Christoph she lived more than 20 years in the Nürtingen castle, she died in Nürtingen.After losing both her husband and her eldest son in 1568, Anna Maria fell madly in love with the young Landgrave George I of Hesse-Darmstadt (1547–1596).Soon afterwards she became mentally confused and was locked up.George I later married her daughter Eleonore.She died in 1589 and was buried in the St. George's Collegiate Church in Tübingen. [SEP] Knowledge 2: Christoph, Duke of Württemberg
Christoph of Württemberg, Duke of Württemberg (12 May 1515 – 28 December 1568) ruled as Duke of Württemberg from 1550 until his death in 1568.

Answer: George