Question: Who is Louis Ix, Landgrave Of Hesse-Darmstadt's paternal grandmother?
Sentence (from "Louis IX, Landgrave of Hesse-Darmstadt"): Louis IX of Hesse-Darmstadt  (15 December 1719 – 6 April 1790) was the Landgrave of Hesse-Darmstadt from 1768 - 1790.
Relevant evidence: No