The island faced desertion in the early 19th century when Lord Leitrim sought to banish his tenants and put the island's pastures to use for cattle grazing.
Edward Southwell Keppel (1800 – 1883), Dean of Norwich, married Lady Maria, daughter of Nathaniel Clements, 2nd Earl of Leitrim.
Nathaniel Hawthorne | 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 | Charles Lennox, 2nd Duke of Richmond | Nathaniel Lyon | 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 | Nathaniel P. Banks | Leitrim | Hugh Grosvenor, 2nd Duke of Westminster | Edward Harley, 2nd Earl of Oxford and Earl Mortimer | Earl of Devon | Douglas Haig, 1st Earl Haig |
Clements was involved in many charitable activities including Dr Steevens' Hospital, the Erasmus Smith Educational Foundation, the Royal Hospital Kilmainham for retired soldiers, and others.
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He was a developer of property in Georgian Dublin, including part of Henrietta Street where he lived at No. 7 from 1734 to 1757.