The Caesar Knox mentions may be Caesar Lloyd Cummings. Caesar Lloyd Cummings (d. 1792), one of six civilian employees in the War Department, was a free black man. He worked as the department messenger. (At least one source indicates that Cummings had served there since the Board of War's creation in 1777.) However, as he was employed by the War Department and not the Knox household, it is uncertain whether this Caesar is, indeed, Caesar Cummings.
Collection: The Henry Knox Papers.
Electronic reproduction. Marlborough, Wiltshire : AM, 2014. Digitized from a copy held by the Gilder Lehrman Institute of American History.
Gilder Lehrman Institute of American History