Baltimore lawyer (1779–1843) who was inspired to write the “Star-Spangled Banner” after he witnessed the bombardment of Fort McHenry by the British in 1814. ALS signed “F. S. Key,” one page, 7.75 x 9, May 9, 1804. Letter to longtime friend John Leeds Kerr. In full, “Dr. Holmes will deliver you this. He is going to one of the Virginia Counties of your shore & being unacquainted with the route will require some directions - Any civilities shown him will be thankfully acknowledged by your friend.” In good condition, with paper loss under signature from removal of wax seal, intersecting folds, several fold separations, including one affecting final stroke of signature, and scattered toning and wrinkling. R&R COA.