ETYMOLOGY
from Latin instigatrix, female agent-n. from instigare (to instigate, bring about by incitement or persuasion)
EXAMPLE
“…She was (saies Salme∣ron, a main Supporter of the Roman Church among the Tridentine Fathers) cooperatrix, that is, Christs Fellow-laborer in the very Passion to the end, that as a Man and a Woman did work out the utter ruine of Man-kind, so a Man and a Woman might perfect their Salvation; and as well here as there, the Woman should be the Instigatrix, or the first Sollicitress, Eve to temt, and Mary to set the Man to work. Thus she is, saies another, the Mother of Redemtion, by shedding her Soul into compassion under, as Christ did his in Passion upon the Cross…”
From: Saul and Samuel at Endor,
or The new waies of salvation and service, which usually temt men to Rome, and detain them there Truly represented, and refuted,
By Daniel Brevint, 1674
Lexicophilia 