instīgātor, ōris, m. [instigo],
a stimulator , instigator (post-Aug.): sibi quisque dux et instigator, Tac. H. 1, 38: superfluus, Aus. Ep. 17 fin. : accusationis, Dig. 3, 2, 20.
īnstīgātor ōris, m instigo, a stimulator, instigator : sibi quisque, Ta. ...
An Elementary Latin Dictionary
·noun One who instigates or incites. ...
Webster's Dictionary of the English Language