Where does “instigatus” come from?

instigatus (Latin) comes from Latin instigo, from Proto-Indo-European (s)teyg- — to be sharp; to sting.

Ancestry of “instigatus”, step by step

Step	Language	Word	Meaning
1	Latin	instigo	I stimulate, set on, incite, rouse or urge
2	Proto-Indo-European	(s)teyg-	to be sharp; to sting

instigatus — Etymology, Origin & Word History | Etymology Explorer