Thomas Dawson was born in 1725 and succeeded his father in 1766. Between 1749 and 1768 he was MP for Co. Monaghan. On 28 May 1770 he was created Baron Dartrey of Dawson Grove, on 19 June 1785, Viscount Cremorne, and on 20 November 1797 he was created Baron Cremorne of Castle Dawson with a special remainder, since his three sons had died young (two of them in the same year, 1787), to his nephew, Richard Dawson. He married firstly, on 15 August 1754, Anne, youngest daughter of Thomas Fermor, 1st Earl of Pomfret. She died on 1 March 1769 and was buried at Kilcrow, the parish church of Ematris, built within the Dawson Grove demesne by Alderman Richard Dawson in 1729.During the 1798 rebellion in Ireland, ... [Lord Cremorne] had his wife's remains and those of the children removed from ... [Kilcrow] and deposited, with those of the children of his second marriage, in Buckinghamshire (probably at Stoke Park, the seat of his relation by marriage, Sir Thomas Penn) Lord Cremorne remarried shortly afterwards, on 8 May 1770. His second wife was Philadelphia Hannah Freame, grand-daughter of William Penn, the founder of Pennsylvania. (Penn's second marriage in 1695/1696 was to Hannah Callowhill, and their second daughter, Margaret, married Thomas Freame)... Philadelphia was their daughter, and was born in that city. She died on 14 April 1826 in Stanhope Street, Mayfair. Lord Cremorne died on 1 March 1813 at Stanhope Street, when the barony of Dartrey and viscountcy of Cremorne became extinct. Lord Cremorne's heir was his nephew, Richard Dawson (1762-1807), MP for Co. Monaghan, 1797-1807. He was educated, 1775-1780, at TCD and Magdalen College, Oxford, and married in 1784 Catherine, daughter of Colonel Arthur Graham of Hockley, Co. Armagh, by whom he had a son and four daughters. He was sheriff of Co. Monaghan in 1792-1793, and '... was associated with the family bank in Dublin. He pre-deceased his uncle, dying in 1807. a 58-foot-high Corinthian limestone column, surmounted by an urn and situated on the Monaghan- Cootehill road and within the former Dawson Grove demesne. The arms of the Dawson family appear on two sides of the square plinth at its base and the following inscription on the other two: "This column was erected by the free and independent electors of the county of Monaghan to perpetuate the memory of Richard Dawson Esq., who was unanimously returned by them to five successive parliaments. He died their faithful representative on 3 September 1807, aged 44 years." As a result of Richard Dawson's premature death, it was his son, Richard Thomas Dawson (1788-1827), MP for Co. Monaghan, 1812-1813, who succeeded Lord Cremorne in 1813, though he did not succeed to his great-uncle's viscountcy but only to the barony of Cremorne created with a special remainder in 1797. He, too, died young, aged 38, in 1827, leaving two sons. The younger, Colonel the Hon. Thomas Vesey Dawson (1819-1854) was killed at the battle of Inkerman in 1854. He is commemorated by yet another Dawson monument, this one a granite pillar erected nearly opposite the County Courthouse in Monaghan in 1858. The elder son, Richard Dawson, 3rd Lord Cremorne (1817-1897), succeeded at the age of ten and was under the tutelage of guardians and/or the Court of Chancery until 1838. He was created a peer of the United Kingdom as Baron Dartrey in 1847, was a Lord-in-Waiting, 1857-1858 and 1859-1866, and was created Earl of Dartrey, also in the peerage of the United Kingdom, in 1866. In politics he was a Whig/Liberal, until he broke with Gladstone over the first Home Rule Bill in 1886 and became a Liberal-Unionist. He was Lieutenant of Co. Monaghan from 1871 until his death in 1897. In 1841, he married Augusta, second daughter of Edward Stanley of Cross Hall, Lancashire, and grand-daughter of the 8th Earl of Lauderdale. She died in 1887. On the death of the 1st Earl of Dartrey in 1897, he was succeeded by his eldest son, Vesey Dawson, 2nd Earl of Dartrey (1842-1920), Lord Dartrey married in 1882 and had two daughters. He was succeeded in the earldom by the Hon. Anthony Lucius Dawson, youngest and only surviving son of the 1st Earl. The 3rd Earl died without issue in 1933, when all the family honours became extinct. However, he never came into possession of the remnant of the family estate, which on 4 June 1921 was vested formally – possibly as a result of some inter-familial arrangement - in Lady Edith Anne, elder daughter of the 2nd Earl. She was the last Dawson to live in Dartrey House, and it was she who was forced to take the decision to demolish it in 1946.