Question: When was Wilhelm, Duke Of Oldenburg's mother born?
Sentence (from "Princess Ulrike Friederike Wilhelmine of Hesse-Kassel"): Princess Ulrike Friederike Wilhelmine of Hesse-Kassel  (31 October 1722, Kassel – 28 February 1787, Eutin) was a member of the House of Hesse-Kassel by birth, and of the House of Holstein-Gottorp through her marriage to Frederick Augustus
Relevant evidence: Yes