a helper, an aider ...1624 obs.
from Latin opitulātor a helper from opitulāt- , past participial stem of opitulārī to bring aid, to assist + -or
FIRST DOCUMENTED USE
1624 - see EXAMPLE below
"...Papists make Saints speciall opitulators..." (Heading on p. 343)
From: A Replie to Iesuit Fishers Answere to Certain Questions Propou[n]ded by his most Gratious Matie: King Iames
- Francis White