Question: Wilhelmine Schröder was the royal mistress of a man that was King of Sweden beginning in what year?
Sentence (from "Wilhelmine Schröder"): Fredrika Vilhelmina "Wilhelmine" Augusta Schröder (23 September 1839 - died 13 May 1924), was a Swedish telegraphist, writer and journalist, and was also the confidant and royal mistress of King Charles XV of Sweden.
Relevant evidence: Yes