Salusbury’s family had long been settled in North Wales, but it was his marriage which determined his public career. In 1792 he succeeded his wife’s uncle John Morgan of Tredegar as unopposed Member for Monmouthshire, and in 1794 to his wife’s brother’s estate of Llanwern.
That year, to suit the convenience of his nephew by marriage Charles Morgan, Salusbury transferred to a seat for Brecon, on the Morgan interest. Charles Morgan took the precaution of being elected for Brecon first, until his return for Monmouthshire was certain. Salusbury opposed the Monmouthsire petition for the removal of ministers in April 1797. He wrote to Pitt, 10 Nov. 1798, complaining of his inadequate income and its effect on his parliamentary attendance, but he applied for patronage explicitly only for his friends, not for himself.
Salusbury was listed a supporter of Pitt in September 1804, after his return to power, but with reference to his vote for the criminal prosecution of Melville, 12 June 1805, after he had been listed both for and against the censure on 8 Apr., he appeared in July as ‘doubtful Pitt’. On Pitt’s death he informed Addington, now Lord Sidmouth, that he wished to see him first lord of the Treasury and Tierney chancellor of the Exchequer, adding that though confined by gout he would ‘come up immediately if you have any occasion for my support’.
These tentative outbursts of independence caused Perceval to propose to Salusbury, who had voted with government on the Scheldt expedition, 30 Mar. 1810, the unpopular task of moving Burdett’s committal to the Tower, 5 Apr. 1810. Perceval is reported to have said, ‘You would be a proper person to move it, being a country gentleman, and not always voting with us, it could not seem from ministerial influence’. Salusbury evidently wished to decline, not being accustomed to such a conspicuous role, but Perceval reassured him: ‘A few words will be sufficient, as we shall support you’. So it was, and Salusbury’s motion was carried; whereupon he was ‘frightened out of town’ by the hostility of the mob, finding safety only at home in Llanwern. Even there he was exposed to embarrassment: he had formed a banking partnership at Newport and Abergavenny, Salusbury, Jones & Co., shortly before, and the local radicals attempted a run on it. His friends felt that Salusbury ‘might well ask for a prebendary of Westminster’ as a reward for a service to government which had brought such unpleasant experiences upon his unsuspecting head.
In 1816 Salusbury went bankrupt and was detained in King’s Bench prison. Even now his pride forbade him to apply for relief on his own behalf: but Sir Robert Williames Vaughan informed Sidmouth of his plight. Sidmouth regretted, 5 June 1816, that he was unable to do anything ‘to promote his comfort during the remainder of his life’, but pointed out that there was not ‘an office suited to Sir Robert’ within his own ‘very limited patronage’. Salusbury died at Canterbury, 17 Nov. 1817.
