instigateur
instigator, ringleader
noun an-stee-gah-TUHR Rare
Origin: Latin instigator, one who urges on
Usage Note
Instigateur refers to the person who initiates or incites an action, often a negative one like a plot or crime. The feminine form is instigatrice. The related verb instiguer is rarer; more common is the phrase à l'instigation de ('at the instigation of').
Examples
"Il était l'instigateur du complot."
Natural Translation
He was the instigator of the plot.

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