Dorothy Sidney was born 1617 to Robert Sidney, 2nd Earl of Leicester (1595-1677) and Dorothy Percy (1598-1659) and died 5 February 1684 of unspecified causes. She married Henry Spencer, 1st Earl of Sunderland (1620-1643) 20 July 1639 . She married Robert Smythe (bef1652-) 8 July 1652 . Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Henry II of England (1133-1189)/s, Hugh Capet (c940-996)/s, William I of England (1027-1087)/s, Rollo of Normandy (860-932)/s.
|Dorothy Spencer (1640-1670)||1640 Althorp, Northamptonshire, England, United Kingdom||16 December 1670 Lincoln's Inn Fields, London, Middlesex, England, United Kingdom||George Savile, 1st Marquess of Halifax (1633-1695)|
|Robert Spencer, 2nd Earl of Sunderland (1641-1702)||1641 Paris, France||28 September 1702 Althorp, Northamptonshire, England, United Kingdom||Anne Digby (1646-1715)|
|Penelope Spencer (c1642-1667)|