Question: When did Johann Leopold, Hereditary Prince Of Saxe-Coburg And Gotha's mother die?
Sentence (from "Johann Leopold, Hereditary Prince of Saxe-Coburg and Gotha"): Johann Leopold, Hereditary Prince of Saxe-Coburg and Gotha (Johann Leopold William Albert Ferdinand Victor; 2 August 1906 – 4 May 1972) was the eldest son of Charles Edward, Duke of Saxe-Coburg and Gotha, and Princess Victoria Adelaide of Schleswig-Holstein-Sonderburg-Glücksburg.
Relevant evidence: Yes