Famed for his puckish demeanour and fondness for practical jokes, John Montagu (styled Lord Monthermer from 1702 until his succession as duke of Montagu) became heir to his father’s dukedom following the early death of his two older brothers, the latter of whom (Winwood Montagu, styled Lord Monthermer 1689-1702) had drunk himself to death following an embassy to Hanover.
All his talents lie in things only natural in boys of 15 years old, and he is about two and fifty; to get people into his garden and wet them with squirts, and to invite people to his country houses, and put things into their beds to make them itch, and 20 such pretty fancies like these.
Opinions of Sarah Duchess Dowager of Marlborough, 58.
As a result of such reservations it was agreed as a condition of the match that the young couple should not cohabit until Monthermer had attained the age of 16.
Having succeeded both to the dukedom of Montagu and the office of master of the great wardrobe on his father’s death, the new duke was confronted by Duke Ralph’s debts, which were reputedly in excess of £40,000 as well as the £20,000 mortgage on the sumptuous town house built by the 1st duke in Bloomsbury.
Montagu wanted to rejoin his father-in-law on campaign in the summer of 1709. Attempts by his kinsman, Charles Montagu, Baron (later earl of) Halifax, to dissuade him proved to be unnecessary as he received a firm refusal from Marlborough, who recommended that he postpone his expedition to the following year.
it is certainly possible that besides being so ill in every thing, my Lord Monthermer, from being the duke of Montagu’s son (that was always so famous for using his wife and everybody ill) may very soon grow to think ill of me, and not care for me, but that I can’t help now.
Add. 61450, f. 35.
The duchess of Marlborough also appears to have revised her opinion of someone she had initially considered ‘the best match in England’ at about this time, though her antipathy was directed primarily at her daughter with whom she was rarely on good terms.
Still a minor at the time of the trial of Henry Sacheverell in March 1710, a few days later Montagu at last quit England for the campaign in Flanders.
Montagu’s return to England in August 1711 may have been prompted by the death of his young heir, John Montagu, styled marquess of Monthermer, earlier that month. This was almost certainly the ‘sad calamity’ referred to by Halifax in a letter to Robert Harley, later earl of Oxford.
Montagu dined with Prince Eugene of Savoy during his visit to London in January 1712.
Present in the House on four of the prorogation days between January and March 1713, Montagu resumed his seat in the third session on 9 Apr. 1713. Although he was estimated by Harley (now promoted earl of Oxford) as being opposed to the bill confirming the 8th and 9th articles of the French commerce treaty on 13 June, he attended on just five days of the 77-day session and was absent from the House after 5 May. That summer Montagu again travelled to Holland, but he was kept informed of events at home by Swift, who provided him with details of the efforts of his kinsman, Edward Richard Montagu‡, styled Viscount Hinchingbrooke (‘a strenuous Tory’) to be elected for Huntingdonshire.
Montagu took his seat at the opening of the new Parliament on 16 Feb. 1714, after which he was present on just over half of all sitting days. On 30 Mar. he received the proxy of his Buckinghamshire neighbour, Scroop Egerton, 4th earl (later duke) of Bridgwater, which was vacated by the close of the session. Nottingham forecast that he would oppose the schism bill, and on 15 June he subscribed the protest at the resolution to pass the measure. He attended the House for just five days of the 17-day session that met in the aftermath of the queen’s death. Following the dissolution Montagu was expected to support a compromise arrangement in the forthcoming contest in Buckinghamshire, by which the seats were shared between the two parties.
A long-standing supporter of the Hanoverian succession, Montagu was amply rewarded by the new regime. In 1715 he was appointed to the lieutenancies of both Northamptonshire and Warwickshire, and over the ensuing years he received a string of ceremonial appointments and military commissions, culminating in his promotion as a general in the army in 1746 during the Jacobite rebellion.
The great lament his ripen’d glories fled;
The poor lament him, whom his bounty fed…
Ages to come shall emulate his fame,
And every virtue kindle at his name.Gent. Mag. xix. 375.
In the absence of a male heir, at his death the dukedom became extinct. His estates were divided between his two daughters, Isabella, duchess of Manchester, and Mary, countess of Cardigan. The dukedom of Montagu was later recreated for the latter’s husband, George Brudenell* [610], 4th earl of Cardigan.
