Another word for instigator

Again Cesare was suspected as the instigator of the deed, and in fact he almost admitted it himself.
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.
She stopped, realizing she had been the instigator of this.
Murat's minister of police was a certain Malghella (a Genoese), who favoured the Carbonari movement, and was indeed the instigator of all that was Italian in the king's policy.
In spite of his near relationship to the Protector's family, he was one of the most violent opponents of the assumption by Cromwell of the royal title, and after the Protector's death, instead of supporting the interests and government of his nephew Richard Cromwell, he was, with Fleetwood, the chief instigator and organizer of the hostility of the army towards his administration, and forced him by threats and menaces to dissolve his parliament in April 1659.

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