Linda, I am researching the descendants of a John Cadwalader who arrived in Philadelphia in 1697. His Great-Great-Granddaughter, Ann Cadwalader Ringgold married a William Ludwig Schley in Washington County, Maryland, 28 Sep 1824. William Schley's Grandfather, George Jacob Schley had a son named Jacob Schley born 28 Mar 1782. I have no further information on this Jacob Schley.
It is possible that your Jacob was a descndant of George Jacob Schley through another son, John Thomas Schley.
George Jacob Schley was the son of John Thomas Schley who emigrated to Philadelphia in 1737. He subsequently moved to Western maryland and founded Frederick, Maryland.