Ewing was an obscure Irishman, whose family it has not been possible to trace. He may have been the son of James Ewing of Prussia Street, Dublin, whose will was proved in 1790, or James Ewing of Templemoyle, county Londonderry, whose will was proved in 1791.
At the general election of 1830 he was returned unopposed for the seat he had purchased at Wareham from its patron, John Calcraft, paymaster of the forces in the duke of Wellington’s administration.
