As the eldest son of an ambitious politician, Montagu’s early life was tailored to fit his father’s priorities. He and his brother Walter were educated together at Eton and at Sidney Sussex, where their uncle James Montagu had formerly been master.
Montagu’s marriage was an issue of prime concern, especially after his father’s abrupt replacement as lord treasurer by Sir Lionel Cranfield* in September 1621.
Montagu was one of a number of young courtiers who joined the prince in Madrid in April, where he was probably charged with keeping his father’s hopes for preferment alive.
In the spring of 1624, Montagu was returned as senior knight for Huntingdonshire on the interest of his father, a major landowner within the county since his purchase of Kimbolton Castle. He left little trace on the records of the session, being named to the committee for the estate bill of the Sussex Catholic Viscount Montagu (5 Apr.) - no relation - and another for the bill to confirm the division of the newly drained Erith and Plumstead marshes in Kent (10 April).
Montagu’s first wife died, probably in childbirth, in January 1625, whereupon Buckingham (now a duke) assured Montagu that the severance of their family ties would not diminish his regard.
Although his father served as lord privy seal throughout the 1630s, Montagu kept out of the limelight until the summer of 1640, when he was one of the 12 peers who petitioned Charles to call another Parliament rather than resume the war against the Covenanters. A leading radical in the Long Parliament, he was the only peer whom the king proposed to impeach along with the ‘Five Members’ in January 1642.
Manchester re-emerged from obscurity in the Convention Parliament of 1660, when he was made Speaker of the restored House of Lords. While he failed to impose conditions on a restored monarchy, he was appointed lord chamberlain, and remained an important political figure to the end of his life.
