Jacob came from a successful Cambridgeshire yeoman family which had begun to purchase freeholds in Gamlingay by 1557. His father, Abraham, continued to acquire land there, but made his fortune as a merchant in London, where he joined the customs syndicate headed by Maurice Abbot*.
In 1624 Jacob was elected to Parliament for Plympton Erle, presumably at the request of Cranfield, who was apparently on familiar terms with one of the borough’s patrons, Sir Warwick Hele*.
With Cranfield in disgrace, Jacob seems not to have sought election to the next three Parliaments, but he did not obviously suffer through his master’s fall. In 1627 he was sworn in as an additional clerk to the Privy Council on Charles I’s command. When Abraham lay on his death-bed in 1629 Cranfield sent his most trusted servant to seek a confession that he had committed perjury during the impeachment proceedings, but Jacob refused him access, on the grounds that his father had already made his peace with the world: ‘to have troubled that content had been, if not impious, I am sure unnatural in me’.
During the Caroline Personal Rule Jacob continued to flourish as a financier and customs farmer. He was knighted in 1633, and expended his inheritance by purchasing the manors of Upper Bromley in Middlesex and Woodbury in Gamlingay.
