Devaynes was a big Government contractor, and between 1776 and 1782 held together with John Henniker, George Wombwell and Edward Wheler army victualling contracts for 12-14,000 men in America.
No previous connexion between Devaynes and Barnstaple has been traced: in all probability it was a cash nexus. He was defeated there in 1780 and 1796. In the House he voted invariably with the Government: with North in his first Parliament, and with Pitt in his second—‘Devaynes to have early notice vice Bassett’ (a supporter of the Coalition) Robinson had written in a paper of February-March 1784.
He died 29 Nov. 1809. A ‘mulatto daughter’ is mentioned in his will, which suggests his having at one time resided in Africa.
