Thomas Jonathan Jackson was a great-grandson of John Jackson (1715/1719–1801) and Elizabeth Cummins (also known as Elizabeth Comings and Elizabeth Needles) (1723–1828). John Jackson was an Irish Protestant from Coleraine, County Londonderry, Ireland. While living in London, England, he was convicted of the capital crime of larceny for stealing £170; the judge at the Old Bailey sentenced him to seven years penal transportation. Elizabeth, a strong, blonde woman over tall, born in London, was also convicted of felony larceny in an unrelated case for stealing 19 pieces of silver, jewelry, and fine lace, and received a similar sentence. They both were transported on the merchant ship "Litchfield", which departed London in May 1749 with 150 convicts. John and Elizabeth met on board and were in love by the time the ship arrived at Annapolis, Maryland. Although they were sent to different locations in Maryland for their bond service, the couple married in July 1755.