Through his education Campbell acquired some legal expertise, which complemented his natural talents as a politician and made him an ideal right-hand man to his brother, the duke of Argyll, at the head of the powerful Campbell interest. Indeed, alongside their formidable mother, he was said to exercise a dominating influence over Argyll.
Campbell came into government in April 1705 on Argyll’s appointment as commissioner to the Scottish parliament. Although barely out of his minority, he was given the titular office of lord treasurer (the duties of which were carried out by a commission), in order that he would be able to sit and vote in parliament, and was also named to the Scottish Privy Council.
Both brothers voted in the Scottish parliament for ratification, and afterwards Ilay was selected, at Argyll’s express request, to serve as one of the representative peers in the first Parliament of Great Britain.
Ilay was present in the House on 29 Jan. 1708 for the first reading of the bill ‘for rendering the Union ... more entire and complete’, and followed Argyll, sitting in the House as earl of Greenwich, in opposing the Squadrone’s scheme for the abolition of the Scottish Privy Council.
Before the representative peers’ election of 1708 Ilay was at last given an army commission, as second colonel in a foot regiment. He was also made an extraordinary lord of session. Thus bound to the court, he attended the election with his brother’s proxy, having been included in the court list. He voted a straight court line, and was safely elected, in spite of reports in July that suggested he might be one of those to have a number of his votes discounted.
Although the new session began in November 1709, Ilay did not return to the House until 1 December. He was then present on 78 per cent of all sitting days. Amenability was a thing of the past: he wanted to exchange his regiment for another and was outraged when John Churchill, duke of Marlborough, would not permit it, so much so that by April 1710 lord treasurer Sidney Godolphin, earl of Godolphin, was describing him as ‘one of the most inveterate’ of his enemies.
By June 1710 Ilay was co-operating very closely with Queensberry’s lieutenant, John Erskine, 22nd earl of Mar [S], who was in turn aligning himself with the Tory opposition led by Robert Harley, later earl of Oxford.
it was very obviously our interest not to mingle ourselves too much with the factions here, I mean as Scotchmen; for, it being very plain that no party here has our country much at heart; the exasperating any side here, might, at some conjuncture or other, draw both upon us and crush us at once.Carstares SP, 786–7.
The following month (July) he wrote to a kinsman, John Campbell, earl of Breadalbane [S], to explain the position he and his brother had taken in the political crisis that resulted in the fall of Godolphin’s administration:
the most compendious description I can make of the present state of affairs is a dispute whether the queen or some of her subjects shall govern… having taken the queen’s side, we are resolved to protect her as far as we have any interest, and I believe her party will easily maintain their ground.
The real purpose of the letter, however, was to secure Breadalbane’s support in the forthcoming peers’ election. Ilay advised him not to ‘engage yourself at all till the very time comes, for it is very hard yet to tell precisely who will be on the right side (as we call it)’. After the dismissal of Godolphin, he wrote again on 25 Aug. explaining that he would have to go to London: the ‘great change lately made ... shows now plainly her Majesty will support herself and her own administration. As for ... the new Parliament, nobody whatsoever doubts of it, and therefore we are busy endeavouring to make the elections as much of a piece as possible’.
An analysis of the new representative peers, prepared by the Episcopalian chaplain to the duchess of Buccleuch, described Ilay as a ‘court Tory’.
In matters of religion Ilay showed no sympathy for the cavalier position, having declared himself against the introduction of any legislation to provide relief for Episcopalians, and had ‘a little engaged his brother that way’. When taxed with this, Argyll was said to have laughed, and said ‘he knows not what his brother means except it be to be head of the Kirk’.
Ilay attended regularly until Parliament was prorogued on 12 June, but was very careful to avoid controversy. When the bill to prohibit the export of flax and linen from Scotland arrived from the Commons, the House went into a committee of the whole on 1 June to consider it. In an account of the debate, John Elphinstone, 4th Lord Balmerino [S], observed with surprise that Ilay, ‘who can speak so well’ made little impact: ‘he never meddled till near the end’, when he ‘spoke a little’. On being asked ‘why he was so silent, he answered, because he was astonished.’
Ilay took his seat again on 7 Dec. 1711, after which he was present on three-quarters of all sitting days. In advance of the session he was entrusted with the proxy of Archibald Primrose, earl of Rosebery [S], which was vacated by Rosebery’s appearance in the House later that month. On 10 Dec. Ilay was noted among those who had voted with the ministry on the ‘No peace without Spain’ motion. Ten days later the House refused Hamilton’s request to be allowed to sit and vote by virtue of his British peerage. Ilay acted as one of the tellers in the division over whether to refer the question to the judges. He then voted in Hamilton’s favour (as had been predicted the day before) and protested against the decision to bar the duke, having, in a ‘very moving speech’, defended the queen’s right to create British peers and argued that to deny Hamilton his seat ‘would be deemed a breach of the Union’.
Most of the boycotters were brought back to the House by the arrival there of the toleration (episcopal communion) bill. Although Ilay had argued against ending the boycott (presumably because he was opposed to this bill, and hoped that the absence of the Scottish peers would ensure its rejection), he was present with other Scots for the second reading on 13 Feb. 1712 and attended the committee of the whole to which it was referred.
Concern over the embarrassing position in which he felt he had been placed by the ministry’s unwillingness to support the Presbyterian establishment in Scotland, combined with resentment that the Scottish secretaryship had not been filled, provoked an extraordinarily histrionic letter from Ilay to lord treasurer Oxford (as Harley had become) in November 1712. He complained bitterly that he had lost Oxford’s favour, and had in effect been ‘disgraced’ by the very person under whose protection he and his brother had abandoned the Whig ministry in 1710. A bemused Oxford added the comment ‘I do not understand this, it having no foundation’. Another outburst followed in January 1713, when Ilay’s unrealistic ambition of being appointed ambassador to Constantinople was dashed. Now, however, he had to deny accusations that he had been scheming against Oxford, and protested his continuing support.
Ilay took his seat in the new session on 9 Apr. 1713. In all he was present for 55 per cent of all sitting days but, having attended for just six days, he absented himself for just over a month. In advance of the session he had warned Oxford that he needed to be in Scotland for some days during April and took the opportunity to request appointment as commissioner of the assembly of the Kirk in place of Atholl. His request was not heeded.
roar and exclaim bloodily against the Union, and seem very positive that the Whig lords would join to dissolve if our peers would help in the meantime to stop the ministry. There are [those] here [say] that the two brothers, finding that their court decays, are making this noise and opposition to force the ministry into their ways.NLS, ms 25276, ff. 65–66.
Ilay was also said to have drunk ‘a new kind of health’ at a public entertainment, toasting ‘the speedy and legal dissolution of the Union’.
Ilay continued to attend the House until the end of the session. Despite his and his brother’s obvious alienation from the ministry, he attempted to preserve his own personal relationship with Oxford, sending letters in which he combined obsequious professions of friendship with fabricated protests against the supposed malicious insinuations of others, and larded his prose with a sanctimonious (and somewhat callow) self-righteousness:
Were it not that I have a private satisfaction in doing what I think right, of what use is it to be innocent? When first I was engaged in your service, and when you were pleased to think well of me, it was when you were unjustly oppressed by a prevailing party, and when I had more of the countenance of the Court than I have at present; if now, when you are at the head of the administration, I have the less art to please, I must rest contented. If when worldly interest might have led me to betray you, I durst be honest, and when it leads me to serve you, I prove otherwise, sure my enemies who think so must in charity add fool to the character they are pleased to give of me.HMC Portland, v. 294–95, 312–13, 327–28.
At the same time, Oxford was being urged by one of his Scottish advisers to turn out both brothers ‘of all they can be turned out of’.
Having succeeded his brother in 1743 to the dukedom of Argyll, Ilay died suddenly in London on 15 Apr. 1761 and was buried at Inverarary. While the dukedom was inherited by a cousin, his own earldom became extinct.
