Instigator

·noun One who instigates or incites.

instigator
instīgātor, ōris, m. [instigo], a stimulator , instigator (post-Aug.): sibi quisque dux et instiga...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
instigator
īnstīgātor ōris, m instigo, a stimulator, instigator : sibi quisque, Ta. ...

An Elementary Latin Dictionary