Diana de Vere, nee Cecil, Countess of Oxford, 1614 William Larkin. Diana Cecil's dress is an amazing tour de force of slashing in this portrait by William Larkin. Married to Henry de Vere, 18th Earl of Oxford, she was the daughter of William Cecil, 2nd Earl of Exeter. Great granddaughter of Elizabeth's Lord Burghley, she became countess of Elgin by her second marriage. She left no issue.