He was unmarried and was succeeded in the barony by his younger brother, Matthew.
Gospel of Matthew | Matthew | Baron | Matthew Flinders | Matthew McConaughey | Matthew Broderick | William Cecil, 1st Baron Burghley | St Matthew Passion | Matthew Barney | Matthew Fox | baron | 4th United States Congress | Matthew Prior | Sacha Baron Cohen | 4th | Matthew Arnold | Joseph Lister, 1st Baron Lister | Joey Baron | Robert Baden-Powell, 1st Baron Baden-Powell | Henry Brougham, 1st Baron Brougham and Vaux | Matthew Sweet | Matthew Perry | Matthew C. Perry | Guy Carleton, 1st Baron Dorchester | Matthew the Apostle | Matthew Herbert | Matthew Prior (cricketer) | John Montagu, 4th Earl of Sandwich | California's 4th State Assembly district | William Wallace, Baron Wallace of Saltaire |
He represented the Cornish constituencies of Bossiney (1786–90), Tregony (1790–95) and St Germans (1806–12) in the British Parliament and succeeded his brother as 4th Baron Rokeby in 1829.
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Montagu was born Matthew Robinson, the son of Morris Robinson of the Six Clerks' Office, Chancery Lane and nephew of Matthew Robinson, 2nd Baron Rokeby.