Etymology
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instigator (n.)

1590s, from Latin instigator "a stimulator," agent noun from instigare "urge on, incite" (see instigation). The classical Latin fem. form instigatrix is recorded in English from 1610s.

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Definitions of instigator

instigator (n.)
someone who deliberately foments trouble;
she was the instigator of their quarrel
Synonyms: provoker / inciter / instigant / firebrand
instigator (n.)
a person who initiates a course of action;
Synonyms: initiator
From wordnet.princeton.edu