instigator

noun

Etymology: From Latin īnstīgātor (“stimulator”), from īnstīgāre (present infinitive of īnstīgō (“to incite, set on, stimulate, rouse or urge”), possibly from Proto-Indo-European *(s)teyg- (“to be sharp, to stab; to puncture; to goad”)) + -or (from -ō (suffix forming masculine agent nouns), from Proto-Indo-European *-h₃onh₂- (suffix forming nouns denoting authority or burden)); cognate with French instigateur. By surface analysis, instigate + -or.

1. A person who intentionally instigates, incites, or starts something, especially one that creates trouble.

   “Near-synonyms: see Thesaurus:troublemaker”

   “[T]he Pope doth not keepe his quarter, but will needs breake forth of the rayles and limits of that diſtinction, taking vpon him to be authorized alſo temporally, and that, for the ſuppreſſion and ſubverſion of the Civill Soveraignity, […] whence muſt neceſſarily ariſe either privie complottings, or open attempts, in favour of their opinions, and in furtherance of their deſires, which how farre it will extend, and into how deepe degrees it vſeth to grow, many ſorowfull and fearefull examples hath in this Realme demonſtratively declared vnto vs, to every whereof Papacy hath beene the ſtirrer and inſtigator.”