Question: What is the date of birth of Prince Oskar Of Prussia's mother?
Sentence (from "Augusta Victoria of Schleswig-Holstein"): Augusta Victoria of Schleswig-Holstein (Auguste Viktoria Friederike Luise Feodora Jenny; 22 October 1858 – 11 April 1921) was the last German empress and queen of Prussia by marriage to Wilhelm II, German Emperor.
Relevant evidence: Yes