One who agitates, especially politically
Again Cesare was suspected as the instigator of the deed, and in fact he almost admitted it himself.
She stopped, realizing she had been the instigator of this.
The main instigator was Charles I., duke of Bourbon, who three years before had attempted a similar rising, and had been forced to ask pardon of the king.
A conspiracy, of which Admiral Wandenkolk was the prime instigator, was discovered, and those who had taken part in it were banished to the distant state of Amazonas.