instigator

alkuunpanija

yllyttäjä A person who intentionally instigates, incites, or startVerb starts something, especially one that creates trouble.
(quote-book)|chapter=An Examination of a Position Published by P. R. in the Preface of His Treatise, Tending to Mitigation, Concerning the Lawfullnesse of the Popes Power ouer Princes: With a Defence of the Oath of Allegiance|title=A Comparative Discovrse of the Bodies Natvral and Politique. Wherein out of the Principles of Nature, is Set Forth the True Forme of a Commonweale, with the Dutie of Subiects, and the Right of the Soueraigne: Together with Many Good Points of Politicall Learning, Mentioned in a Briefe after the Preface|location=London|publisher=Printed for Iohn Bill|year=1606|page=92|pageurl=https://books.google.com/books?id=JYEsAQAAMAAJ&pg=RA1-PA92|oclc=65355402|passage=The Pope doth not keepe his quarter, but will needs breake forth of the rails 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.
(quote-book)
1964, Albert Pepitone, “The Reaction to Boastfulness”, in Attraction and Hostility: An Experimental Analysis of Interpersonal and Self Evaluation (The Atherton Press Behavioral Science Series), New York, N.Y.: Atherton Press, (w) http://www.worldcat.org/oclc/490312942 490312942; reprinted New Brunswick, N.J.: Aldine Transaction, (w), 2009, (ISBN), https://books.google.com/books?id=wBIJG0mrbaEC&pg=PA77 page 77:

In studies designed to arouse aggression, the instigator often not only threatens the subject, but also expresses an extremely high self-evaluation. Subjects are insulted about their intelligence, sexual attractiveness, and character, and, at the same time, the instigator implies or explicitly describes his own superiority in these respects.