Dorothy Percy, Countess of Northumberland was the younger daughter of Walter Devereux, 1st Earl of Essex by Lettice Knollys, and the wife of Henry Percy, 9th Earl of Northumberland. Lady Dorothy Percy
Portrait identified as Dorothy Devereux (on the left) and her elder sister Penelope Devereux, c.1581
Lettice Knollys
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Lettice Knollys was an English noblewoman and mother to the courtiers Robert Devereux, 2nd Earl of Essex, and Penelope, Lady Rich. She was Countess of Essex during her first marriage to Walter Devereu
Dorothy Percy, Countess of Northumberland
…Countess of Northumberland (formerly Perrot, née Devereux; 1565 – 3 August 1619) was the younger daughter of Walter Devereux, 1st Earl of Essex by Lettice Knollys, and the wife of Henry Percy, 9th Earl of Northumberland. Lady Dorothy Percy (née Devereux; c. 1564–1619) was an English noblewoman and Countess of…
Lettice Knollys as Countess of Leicester, c. 1585 by George Gower
Walter Devereux, 1st Earl of Essex, Lettice Knollys' first husband in 1572, aged 32
Robert Dudley, Earl of Leicester, 1575, aged about 43