Question: What is the date of death of Prince Albert Of Schleswig-Holstein-Sonderburg-Glücksburg's mother?
Sentence (from "Princess Adelheid of Schaumburg-Lippe"): Princess Adelheid of Schaumburg-Lippe (9 March 1821 in Bückeburg, Schaumburg-Lippe – 30 July 1899 in Itzehoe, Schleswig-Holstein, Germany) was a member of the House of Schaumburg-Lippe and a Princess of Schaumburg-Lippe by birth.
Relevant evidence: Yes