Context : Barbara Radziwiłł (Belarusian: Барбара Радзівіл, Lithuanian: Barbora Radvilaitė, Polish: Barbara Radziwiłłówna; 6 December 1520/23 -- 8 May 1551) was Queen of Poland and Grand Duchess of Lithuania as consort of Sigismund II Augustus, the last male monarch of the Jagiellon dynasty. 
Question : What is Barbara Radziwiłł's spouse's name?
Sigismund II Augustus