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.
The town name is the product of a misspelling of Rokeby (after Henry Montagu, the 6th Baron Rokeby of Armagh, after whom Rokeby Road in Subiaco is also named).
Robinson was created a baronet on 10 March 1731, with remainder to his brothers and to Matthew Robinson, and from November 1735 to February 1742 he was a commissioner of excise.
Baron | William Cecil, 1st Baron Burghley | baron | Sacha Baron Cohen | Joseph Lister, 1st Baron Lister | Joey Baron | Robert Baden-Powell, 1st Baron Baden-Powell | Henry Brougham, 1st Baron Brougham and Vaux | Guy Carleton, 1st Baron Dorchester | William Wallace, Baron Wallace of Saltaire | William Tyssen-Amherst, 1st Baron Amherst of Hackney | Rokeby | James Mackay, Baron Mackay of Clashfern | Hercules Robinson, 1st Baron Rosmead | George Brydges Rodney, 1st Baron Rodney | Beechcraft Baron | Thomas Seymour, 1st Baron Seymour of Sudeley | Thomas Denman, 1st Baron Denman | Stuart Rendel, 1st Baron Rendel | Norman Foster, Baron Foster of Thames Bank | John Moore-Brabazon, 1st Baron Brabazon of Tara | Charles Cochrane-Baillie, 2nd Baron Lamington | Charles Calvert, 5th Baron Baltimore | Benedict Calvert, 4th Baron Baltimore | Baron Hans Heinrich Thyssen-Bornemisza | William Ponsonby, 1st Baron Ponsonby | Walter Rothschild, 2nd Baron Rothschild | Sidney Herbert, 1st Baron Herbert of Lea | Robert Napier, 1st Baron Napier of Magdala | Martin Conway, 1st Baron Conway of Allington |