Question: Who is William August, Duke Of Saxe-Eisenach's maternal grandfather?
Sentence (from "Marie Elisabeth of Brunswick-Wolfenbüttel"): Marie Elisabeth of Brunswick-Wolfenbüttel (7 January 1638 - 15 February 1687), was a German noblewoman member of the House of Welf and by her two marriages Duchess of Saxe-Eisenach and Saxe-Coburg.
Relevant evidence: No