Mary Bentinck was born circa 1679 to Hans Willem Bentinck, 1st Earl of Portland (1649-1709) and Anne Villiers (c1651-1688) and died 20 August 1726 of unspecified causes. She married Algernon Capell, 2nd Earl of Essex (1670-1710) 28 February 1698 . She married Conyers d'Arcy (-1758) August 1714 .
|Offspring of Algernon Capell, 2nd Earl of Essex and Mary Bentinck (c1679-1726)|
|William Capell, 3rd Earl of Essex (1698-1743)||1698||8 January 1743||Jane Hyde (c1699-1724) Jane Hyde (c1699-1724) Elizabeth Russell (bef1711-1784)|
|Elizabeth Capell (c1699-)|
|Mary Capel (-1762)|