Question: Who is William August, Duke Of Saxe-Eisenach's maternal grandfather?
Sentence (from "William August, Duke of Saxe-Eisenach"): All his older brothers died before his father, and Wilhelm August, the fifth and youngest child, was born nine days after the death of Adolf Wilhelm (21 November 1668) and succeeded him in the duchy of Saxe-Eisenach from the moment of his birth, under the guardianship of his uncle Johann Georg.
Relevant evidence: No