On the death of the 5th Earl of Peterborough in 1814, the title passed to his elder half-sister, Mary.
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On his death in 1697, the earldom was inherited by the his nephew, Charles and the barony was inherited by his only child, Mary, the estranged wife of the 7th Duke of Norfolk.
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The fifth baron was created Earl of Peterborough in 1628 and the title then passed to his son, the second earl, in 1644.
In 1678 she married Charles Mordaunt, 2nd Viscount Mordaunt (1658–1735), later 3rd Earl of Peterborough, and created Earl of Monmouth (in 1689).
It was created in 1628 for John Mordaunt, 5th Baron Mordaunt (see Baron Mordaunt for earlier history of the family).
By his wife Elizabeth, daughter of William Howard, 3rd Baron Howard of Effingham, he left two sons: Henry Mordaunt, 2nd Earl of Peterborough and John, afterwards Lord Mordaunt of Reigate and Viscount Mordaunt of Avalon; and a daughter, Elizabeth, who married Thomas, son and heir to Edward Howard, 1st Lord Howard of Escrick.
He served in Vienna as secretary to the Earl of Peterborough on his embassy to the Emperor from 1711–12, later acting as Peterborough’s “charge d’affaires” in Vienna from April 1711 until late 1714.
Peterborough | James Earl Jones | Prince Edward, Earl of Wessex | Louis Mountbatten, 1st Earl Mountbatten of Burma | Herbert Kitchener, 1st Earl Kitchener | Earl | Frederick Roberts, 1st Earl Roberts | Earl of Derby | Earl Warren | Earl of Pembroke | Robert Harley, 1st Earl of Oxford and Earl Mortimer | Earl of Warwick | Thomas Wentworth, 1st Earl of Strafford | Edward Smith-Stanley, 14th Earl of Derby | Earl of Shrewsbury | William Pitt, 1st Earl of Chatham | Simon de Montfort, 6th Earl of Leicester | Richard Neville, 16th Earl of Warwick | Earl of Leicester | John Scott, 1st Earl of Eldon | Robert Devereux, 2nd Earl of Essex | Robert, 1st Earl of Gloucester | Edward Harley, 2nd Earl of Oxford and Earl Mortimer | Earl of Devon | Douglas Haig, 1st Earl Haig | My Name Is Earl | Edward Hyde, 1st Earl of Clarendon | Earl Scruggs | Earl of March | Richard Howe, 1st Earl Howe |
In 1707, his attack on Dr. John Freind's vindication of the Earl of Peterborough's conduct in Spain appeared; he was arrested by order of the House of Lords.