 He maintained a low profile during the war, and his uncle Lord Fairfax was treated with respect and consideration despite being the only resident peer in the American colonies.Following the death of Lord Fairfax in 1781, Martin's brother Reverend Denny Martin Fairfax inherited the Northern Neck Proprietary, and Martin was given the Greenway Court estate.He took his uncle's housekeeper Mrs. Crawford as his mistress and died unmarried in 1798.