Source : Webster's Revised Unabridged Dictionary (1913)

Inciter \In*cit"er\, n.
   One who, or that which, incites.

Source : WordNet®

inciter
     n : someone who deliberately foments trouble; "she was the
         instigator of their quarrel" [syn: {instigator}, {provoker},
          {instigant}, {firebrand}]