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Son of Robert Sidney, 2nd Earl of Leicester and Lady Dorothy Percy, Countess of Leicester Brother of Dorothy Sydney, Countess of Sunderland; Philip Sidney, 3rd Earl of Leicester; Algernon Sidney; Mary Sidney; Lady Lucy Sidney and 6 others; Diana Sidney; Frances Sidney; Henry Sidney, 1st Earl of Romney; Elizabeth Sidney; Margaret Sidney and Isabella Smythe « less
Died unmarried, but fathered the Duke of Monmouth.