Barker, Jacob, 1779-1871. Letter, 1866 June 13. 1 letter. Location: Misc. Jacob Barker was a New York financier who was instrumental in securing a loan of $5,000,000 for the United States to finance the War of 1812. Jacob Barker in New Orleans, La., writes William A. Baker regarding a miniature portrait of himself painted by Henry Inman at New York around 1845. Mss. 3916.