Task: Question Understanding
Input (English): Context : Mary Villiers, Countess of Buckingham (née Beaumont; c. 1570 -- 19 April 1632) is perhaps best known as the mother of the royal favourite Sir George Villiers, 1st Duke of Buckingham. 
Question : What is Mary Villiers, Countess of Buckingham's spouse's name?
Output (English): spouse