Blanche Cavendish, Countess of Burlington, was the wife of William Cavendish, 2nd Earl of Burlington, who would later become the 7th Duke of Devonshire. Wikipedia
Born: January 11, 1812
Died: April 27, 1840 (age 28 years)
Grandchildren: Victor Cavendish, 9th Duke of Devonshire, Lord Richard Cavendish, William Egerton, and more
Spouse: William Cavendish, 7th Duke of Devonshire (m. 1829–1840)