MacKay Champion Genealogy - Person Sheet
NameJaques Hartog 
Birth Dateca 1855
Notes for Jaques Hartog
A Companion to the Reconstruction Presidents, 1865 - 1881
edited by Edward O. Frantz
Grant hired a courier named Jacques Hartog while in France. Young described him as a “native of Holland, educated in Paris, and a citizen of thew rold.” Hartog’s fluency in languages helped the Grant party, but discount Jesse’s unverified story of his father’s bungled stock purchase that ultimately benefited the courier.
https://books.google.ca/books?id=f5g6AwAAQBAJ&...20Grant.&f=false