A chief fiend (devil, demon or monster).
(preceded by “the”, often capitalized) Satan.
(transferred sense) A diabolically evil person.
- 1690, anonymous translator, The Royal Wanton (attributed to Gregorio Leti), London: F.B., Part 5, p. 48,
[…] her Arch-fiend and Devil of a Lord, had impudently sent the same Villain to abuse her once again.