Question: What is the date of death of Ernst Gunther, Duke Of Schleswig-Holstein's mother?
Sentence (from "Ernst Gunther, Duke of Schleswig-Holstein"): Ernst Gunther, Duke of Schleswig-Holstein (August 11, 1863 – February 22, 1921) was a son of Frederick VIII, Duke of Schleswig-Holstein and Princess Adelheid of Hohenlohe-Langenburg.
Relevant evidence: Yes