Question: Who is Louis Viii, Landgrave Of Hesse-Darmstadt's paternal grandmother?

Knowledge 1: Louis VIII, Landgrave of Hesse-Darmstadt
Louis VIII (German: "Ludwig") (5 April 1691 – 17 October 1768) was the Landgrave of Hesse-Darmstadt from 1739 to 1768.He was the son of Ernest Louis, Landgrave of Hesse-Darmstadt and Margravine Dorothea Charlotte of Brandenburg-Ansbach. [SEP] Knowledge 2: Ernest Louis, Landgrave of Hesse-Darmstadt
Ernest Louis of Hesse-Darmstadt  (15 December 1667 – 12 September 1739) was Landgrave of Hesse-Darmstadt from 1678 to 1739.His parents were Landgrave Louis VI of Hesse-Darmstadt and Elisabeth Dorothea of Saxe-Gotha-Altenburg (1640–1709).Ernest Louis's desire to emulate the French court under Louis XIV ran his country into debt.Among those patronized in this cultural milieu were the Baroque composer Christoph Graupner and the gambist Ernst Christian Hesse; also bringing into his service architect Louis Remy de la Fosse for his extensive building program.Upon his death in 1739, his country's debt was 4 million "gulden", ten times the annual revenue.
Knowledge 1: Ernest Louis, Landgrave of Hesse-Darmstadt
Ernest Louis of Hesse-Darmstadt  (15 December 1667 – 12 September 1739) was Landgrave of Hesse-Darmstadt from 1678 to 1739.His parents were Landgrave Louis VI of Hesse-Darmstadt and Elisabeth Dorothea of Saxe-Gotha-Altenburg (1640–1709).Ernest Louis's desire to emulate the French court under Louis XIV ran his country into debt.Among those patronized in this cultural milieu were the Baroque composer Christoph Graupner and the gambist Ernst Christian Hesse; also bringing into his service architect Louis Remy de la Fosse for his extensive building program.Upon his death in 1739, his country's debt was 4 million "gulden", ten times the annual revenue. [SEP] Knowledge 2: Louis VI, Landgrave of Hesse-Darmstadt
Louis VI of Hesse-Darmstadt  (25 January 1630 – 24 April 1678) was Landgrave of Hesse-Darmstadt from 1661 to 1678.He was the eldest of three sons of the Landgrave George II of Hesse-Darmstadt and Sophia Eleonore of Saxony.
Knowledge 1: Ernest Louis, Landgrave of Hesse-Darmstadt
Ernest Louis of Hesse-Darmstadt  (15 December 1667 – 12 September 1739) was Landgrave of Hesse-Darmstadt from 1678 to 1739.His parents were Landgrave Louis VI of Hesse-Darmstadt and Elisabeth Dorothea of Saxe-Gotha-Altenburg (1640–1709).Ernest Louis's desire to emulate the French court under Louis XIV ran his country into debt.Among those patronized in this cultural milieu were the Baroque composer Christoph Graupner and the gambist Ernst Christian Hesse; also bringing into his service architect Louis Remy de la Fosse for his extensive building program.Upon his death in 1739, his country's debt was 4 million "gulden", ten times the annual revenue. [SEP] Knowledge 2: Louis V, Landgrave of Hesse-Darmstadt
Louis V of Hesse-Darmstadt (24 September 1577 – 27 July 1626) was the Landgrave of Hesse-Darmstadt from 1596 to 1626.He was born on 24 September 1577 as the son of George I, Landgrave of Hesse-Darmstadt and Magdalene of Lippe.In 1604 he inherited a part of Hessen-Marburg after the death of Louis IV of Hesse-Marburg who was childless.The other half went to Maurice of Hesse-Kassel (or Hesse-Cassel), but since Maurice was a Calvinist, Ludwig claimed a right on the whole of Hesse-Marburg.Lutheran professors of the University of Marburg who refused to convert to Calvinism founded in 1607 the University of Gießen which was named "Ludoviciana".This led to a conflict during the Thirty Years' War, between Louis V, who stood on the side of the Emperor, and Maurice, who was on the side of the Protestants.Hesse-Darmstadt suffered severely from the ravages from the Swedes during the conflict.The Landgrave died in 1626 and he was succeeded by George II, Landgrave of Hesse-Darmstadt.In 1722, Johann Georg Liebknecht, an astronomer at the University of Gießen, named a star, which he thought was a planet, Sidus Ludoviciana after Ludwig V.

Answer: Elisabeth Dorothea of Saxe-Gotha-Altenburg