Barred from Parliament because of his catholicism, Montagu had little opportunity to engage in public life, although he did spend time in London. Household accounts for April-July 1685 suggest that he spent April 1685 in the capital then moved to his estate at Cowdray, Sussex, in the first week in May, before the commencement of the parliamentary session. Similarly, he was in London in January 1686, but left the capital in mid February.
Montagu’s marriage to Mary Molineux cemented his links to the Catholic community. Not only was she a member of a prominent Catholic family, but one of her trustees (William Petre, 4th Baron Petre), was a Catholic, and another (Henry Somerset*, 3rd marquess of Worcester, the future duke of Beaufort), was a former Catholic. The third was William Craven, earl of Craven. Connections apart, the marriage brought little reward. Mary Molineux’s sole assets were her jointure of £1,000 a year from her first husband’s estate and a reversionary interest in an annuity worth £200 a year. Both were subsequently sold and the proceeds used towards the payment of Montagu’s debts. The arrangements Montagu put in place to compensate his wife became the subject of acrimonious litigation after his death. Montagu’s younger brother, the 5th viscount, who had no incentive to underestimate, later stated that the net income of the estate during his brother’s lifetime was £6,000 a year.
As a Catholic, a major landowner and with a considerable interest over the parliamentary borough of Midhurst, it was perhaps only to be expected that the accession of James II would bring Montagu more firmly into public life. In the event he seems to have had little involvement in either county or borough politics until his appointment in February 1688 as lord lieutenant in the place of Charles Sackville, 6th earl of Dorset. Even then, Powis was named to deputize for him while Montagu was absent in France ‘on private affairs’, having been granted a pass to go abroad with his wife in March 1687.
Presumably Montagu’s low profile explains why he was listed as underage when the House was called on 28 Oct. 1689 and 31 Mar. 1690. Virtually nothing is known of his activities during the 1690s, apart from a brief involvement in a petition against the wording of a private bill on behalf of Edward Devereux, 8th Viscount Hereford. His concern stemmed from the recognition implicit in the bill of the Devereux claim to be recognized as the premier viscounts of England.
