Windsor was said to have been ‘stirring’ for his elevation to the Lords for some time before his eventual promotion.
In 1703 Windsor was able to add to his younger son’s inheritance thanks to a lucrative marriage to the widow of the 2nd Baron Jeffreys. His new wife, a niece of the duchess of Portsmouth, was suspected of Catholicism, but she brought with her the Welsh lands of her father, Pembroke, comprising some 60 manors in Wales (the most significant of which was the lordship of Cardiff) as well as an interest at Bramber in Sussex inherited from her former husband.
Godolphin had his revenge two years later when Windsor was put out of his command of the 3rd dragoon guards. Robert Harley (later earl of Oxford) and Abigail Masham were believed to have been behind his removal. The instruction informing Windsor of his replacement (as well as that of his brother Dixie) penned by Charles Spencer, 3rd earl of Sunderland, was curt in the extreme.
Windsor’s rental income rallied in 1709.
In spite of his efforts, Windsor was not among those promoted in September 1711.
I was today to wish my Lord Windsor joy, and he told me he and you used to go hand in hand in your preferments, but now you had so far outstripped him that there was no hopes of his overtaking you unless his nephew [Other Windsor, 2nd earl of Plymouth], and children died, and then he might be before. He spoke this only to show how the world went, for nobody could have more satisfaction in your preferment than he had. I believe he really wishes you well, but I can but think has some little burning of envy.
Add. 22,222, ff. 425, 429, 431; Wentworth Pprs. 237.
William Berkeley, 4th Baron Berkeley of Stratton, confirmed Peter Wentworth’s assessment. On Windsor’s elevation he wondered ‘how a man of his singularity likes coming in with so much company.’
Whatever Windsor’s disappointment at ‘coming in’ as part of a mass creation, he took his seat in the House as Baron Mountjoy on 2 Jan. 1712, introduced between Francis North, Baron Guilford, and Charles Boyle, Baron Boyle (and 4th earl of Orrery [I]). Windsor’s choice of title was intended as a reference to one of his family’s forebears, who had married a sister of Edward Blount†, 2nd Baron Mountjoy, a barony extinguished at the beginning of the seventeenth century. Windsor proved regular in his attendance during the session, being present on 64 per cent of all sitting days. He came under heavy criticism for voting in favour of the grants bill but answered his critics by asserting that he had been told that if he did not vote he would ‘destroy the man to whom he owed it that he had a right to vote at all.’
Windsor took his seat on 9 Apr. 1713, and again proved conscientious in his attendance, being present for approximately 73 per cent of all sitting days. Oxford’s forecast of his likely behaviour in the session proved to be more reliable than that of Swift. On 31 May 1713 Windsor was listed as one of those to be contacted in advance of the vote for confirming the French commerce treaty, and on 13 June he was noted by Oxford as being probably opposed to the measure. The same day he was included in a further list of 12 court supporters expected to oppose the ministry in the vote on the treaty. Other peers listed included Lady Windsor’s uncle, Thomas Herbert, 8th earl of Pembroke, but Windsor’s opposition probably stemmed from his association with John Campbell, 2nd duke of Argyll [S] (also earl of Greenwich), and Arthur Annesley, 4th earl of Anglesey. Both were increasingly hostile to Oxford’s leadership and Windsor appears thereafter to have been a consistent member of Anglesey’s grouping of ‘Hanoverian Tories’.
Despite his growing disquiet at Oxford’s administration, Windsor was one of those detailed to greet the French ambassador, the duc d’Aumont, at this formal entry in July 1713.
In advance of the session Windsor let it be known that he favoured inviting the electoral prince, Prince George, duke of Cambridge, (later King George II), to England in reaction to the news of the queen’s ill health.
Following the death of Queen Anne, Windsor attended ten days of the brief fifteen-day session, but he was said to have been ‘very angry’ not to have been made one of the regents. He was equally critical of the Daily Courant’s reporting of a speech given by Strafford, in which he was said to have declared King George’s ‘acquired right’ to the crown rather than his ‘undoubted’ right, as Windsor insisted it should have been expressed.
Windsor died on 8 June 1738 and was buried according to his wishes next to his wife in Salisbury cathedral. An inventory of his goods at his house in Albemarle Street valued them at a little over £400 but his trustees’ accounts suggest that at the time of his death his estates generated approximately £32,000 p.a.
