Question: When is Rúhíyyih Khánum's husband's birthday?
Sentence (from "Rúhíyyih Khánum"): Rúhíyyih Rabbání (8 Aug 1910 – 19 Jan 2000), born as Mary Sutherland Maxwell and best known by the title Amatu'l-Bahá Rúhíyyih Khánum, was the wife of Shoghi Effendi from 1937, the Guardian of the Baháʼí Faith head of the religion 1921 to 1957.
Relevant evidence: Yes