Learn how to say Instigator correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word instigate:
bring about or initiate (an action or event):
they instigated a reign of terror
I will be instigating legal proceedings
(instigate someone to/to do something) incite someone to do something, especially something bad:
instigating men to refuse allegiance to the civil powers
mid 16th century (in the sense ‘urge on’): from Latin instigat- ‘urged, incited’, from the verb instigare, from in- ‘towards’ + stigare ‘prick, incite’