Question: Who is Princess Charlotte Sophie Of Saxe-Coburg-Saalfeld's maternal grandmother?
Sentence (from "Princess Anna Sophie of Schwarzburg-Rudolstadt"): Louis Frederick I, Prince of Schwarzburg-Rudolstadt (15 October 1667 – 24 June 1718) and Anna Sophie of Saxe-Gotha-Altenburg (1670–1728).
Relevant evidence: Yes