Question: Who is the paternal grandfather of Frederick Christian, Elector Of Saxony?
Sentence (from "Paul Luther"): He was the third son of the German Protestant Reformer Martin Luther and was successively physician to John Frederick II, Duke of Saxony; Joachim II Hector, Elector of Brandenburg; Augustus, Elector of Saxony and his successor Christian I, Elector of Saxony.
Relevant evidence: No