Dorothy Sidney, Countess of Leicester English noble (1598–1659) Parents Dorothy Percy, Countess of Northumberland Henry Percy, 9th Earl of Northumberland Children Henry Sydney, 1st Earl of Romney Lady Isabella Sydney Robert Sydney Lady Lucy Sydney Philip Sidney, 3rd Earl of Leicester Dorothy Spencer, Countess of Sunderland Algernon Sidney Siblings Lucy Hay, Countess of Carlisle Algernon Percy, 10th Earl of Northumberland Henry Percy, Baron Percy of Alnwick Dorothy Perrot Penelope Perrot Henry Percy, Baron Percy Henry Percy, Baron Percy Elizabeth Perrot Partners Robert Sidney, 2nd Earl of Leicester
