James Sewall (1778-1842) was a U.S. officer in the War of 1812, public servant, and early railroad executive. Sewall was the scion of a prominent Maryland family. His great-great-grandfather was Henry Sewall, who immigrated to St. Marys County, Maryland, in 1660; became Secretary of the Province and Counselor; and received numerous parcels of land from Cecil Calvert, 2nd Baron Baltimore. On February 14, 1809, he married Anna Maria Rudulph, daughter of Tobias Rudulph, a large landowner. Together, they had at least four children: James Sewall (1823-1881), Martha, Glenn, and Mary.