Question: When is Mary Grey, Countess Grey's husband's birthday?
Sentence (from "Charles Grey, 2nd Earl Grey"): Charles Grey, 2nd Earl Grey, (13 March 1764 – 17 July 1845), known as Viscount Howick between 1806 and 1807, was Prime Minister of the United Kingdom from November 1830 to July 1834.
Relevant evidence: Yes