Montagu was the second son of Edward Montagu of Horton, Northamptonshire and his wife Elizabeth Pelham, daughter of Sir John Pelham, 3rd Baronet, MP of Halland, Sussex.
He married by licence dated 9 March 1709, Arabella Heath, widow of Robert Heath of Lewes, Sussex, and daughter of John Trevor of Trevalyn, Denbighshire and Plas Teg, Flintshire.
[1] Montagu was returned as Member of Parliament for Northampton on his family's interest at the 1722 British general election and supported the Government.
He voted for the Excise Bill, against the instructions of the Northampton corporation, and as a result, was defeated at the 1734 British general election.
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