A "Negro" named Cesar or Ceasor enlisted in the Continental Army.
Shelley (p. 281) includes "Ceser, Negro" in the list of "Revolutionary War Soldiers, Sailors and Patriots." Presumably, one (if not both) of the two records below are for the same Ceser listed by Shelley.
Bibliography:
My Name is Wells - Hope M. Shelley (2002)
Massachusetts Soldiers and Sailors of the Revolutionary War - Office of the Secretary of State (1896)