Montagu was presumably named after his great-uncle, Sir Henry Sidney†, and, like his elder brother Sir Henry Montagu, he was educated at Christ’s, Cambridge and the Middle Temple, where he was called to the bar in 1601.
Montagu inherited some independent means on his father’s death in 1602, when he was bequeathed £200 in cash, lands in Little Stukeley, Huntingdonshire worth about £75 a year, and a lease of the rectory of Brigstock, Northamptonshire.
Montagu sought a place at Court from December 1603, when James Montagu was appointed dean of the Chapel Royal.
it is a matter he [?Dunne] hath not, but was only put into it to hinder you, and it may not be spoken of. I have dealt earnestly with Sir Walter Cope, he promised to make it in his suit both to the king and my lord of Salisbury [Robert Cecil] for a place extraordinary with a fee. And if that will not be, yet I have promise from Sir Roger Wilbrome [Wilbraham*] if he leave his place [as master of Requests], as he purposeth, to be his man before any. So I hope it will succeed either one way or other.
Ibid. ff. 361, 377.
However, Wilbraham remained in place, and the extraordinary mastership was left vacant. The need for cash to purchase office probably explains why Montagu put Little Stukeley on the market for £1,500 in the autumn of 1605: his willingness to conclude a sale appears to have fluctuated in line with his chances of obtaining office, and his repudiation of the deal in the autumn of 1606 provoked an awkward lawsuit with the prospective purchaser.
Although he had sat in two of the last three Elizabethan parliaments, Montagu was not returned to the Commons in 1604. However, in the summer of 1606 he secured possession of the writ for the Thetford by-election occasioned by the death of Sir Bassingbourne Gawdy*, and used Sir Henry and James Montagu to negotiate with the deceased MP’s brother, Sir Philip Gawdy*, for the nomination to the seat. Although he professed himself agreeable to the idea, Gawdy declined to pledge his interest until he had spoken to Montagu in person. This may have been a delaying tactic, as the borough’s patron, Henry Howard, earl of Northampton, nominated Sir William Twysden* a few days later.
While Northampton was understandably annoyed about Montagu’s attempted interference at Thetford, he had a more general reason to obstruct the rise of the Montagu family because of their connection with William Herbert, 3rd earl of Pembroke, one of his leading opponents at Court, through the earl’s wife, a Sidney.
Montagu’s quest for preferment was sustained during the following years by his brother James, who was appointed bishop of Bath and Wells in 1608. Prince Henry’s secretary was approached about a post in his master’s Household at its expansion in 1610, and Bishop Montagu kept in touch with Wilbraham, probably the man reported to be ‘not very willing to part with the Requests’ in December 1612. Nine months later, the bishop, who was lobbying the queen to sponsor the promotion of Sir Henry Montagu, then recorder of London, to the chief justiceship, fancifully remarked to Sir Sidney that if the scheme succeeded ‘there could be a recorder’s place for you’.
Montagu made his most significant parliamentary speech on 14 Apr., just before a conference with the Lords over the succession rights of the Elector Palatine’s children, when he moved ‘for a committee to consider of the substance of the conference’. This motion may have been planted by attorney-general Sir Francis Bacon, who answered the point Montagu raised by assuring the House that there was ‘no thought but [that] the issue female of a male should inherit the Crown’.
Montagu’s interest in the Wroth bill stemmed from a family connection, as the latter’s widow, a Sidney, was his second cousin. Although heavily encumbered with debt, the estate was substantial and the heir only a few months old, and Montagu hoped for a match with Lady Wroth, who was probably the unnamed widow Bishop Montagu considered ‘worth having, though nothing so rich as she is reported’. The bishop also stated that she had gone to spend Christmas with the Huntingdonshire widower Sir Robert Bevill*, whom he claimed would ‘have the bestowing of her’.
Montagu finally secured the long-awaited mastership of Requests, albeit an extraordinary one, in February 1616.
Montagu’s ambitions were not sated by this preferment. When the surveyorship of liveries in the court of Wards fell vacant on Wilbraham’s death in the summer of 1616 Bishop Montagu approached the favourite on his brother’s behalf, but Villiers secured the appointment for a relative, (Sir) Robert Naunton*.
With hindsight, Montagu’s career prospects faded after death of Bishop Montagu in July 1618.
Montagu’s problems at Court coincided with an escalating quarrel with his eldest brother over the inheritance of some of the family’s estates, an issue about which Sir Edward was peculiarly sensitive, as the reversion lay with his brothers until his second wife produced a son in 1616. Shortly before the birth, Sir Edward had been outraged by the decision of his brother Sir Walter to bequeath the manor of Hanging Houghton, the reversion of which he considered his by right, to the next brother, Sir Henry. On this occasion, the three youngest brothers had assumed a right of arbitration, and forced Sir Edward to accept the transfer as valid.
Under these circumstances, Montagu did not look to his eldest brother for a seat at the general election of December 1620. Instead, with the support of Sir Henry Montagu, he fought Sir Robert Payne* and Sir Robert Bevill for the county seats in Huntingdonshire. He was presumably also backed by Sir Edward’s brother-in-law Sir Robert Cotton*, who had been defeated by Payne at the 1614 election, and was doubtless happy to see his erstwhile opponent worsted.
The Coppingford dispute was apparently settled out of court in 1624, but the quarrel over Brigstock continued until 1629, when Sir Edward complained that ‘the king, my daughter’s marriage and my brother Sidney have had very near £5,000 of me out of purse’. Montagu finally made overtures for a settlement in April 1627,
Rumours of Montagu’s great wealth presumably explain why, in the spring of 1640, he was called upon to contribute £4,000 to the Scottish war effort. This demand was later halved, but he refused to pay, and was removed from office shortly after the dissolution of the Short Parliament.
Montagu spent the remainder of his life at Hinchingbrooke, although he was assessed for taxation at Westminster, where his new wife had a house.
