Merlin: What art thou, spirit? of what name, or order?
For I have viewed thee in my magic glass,
Making thy moan among the midnight wolves,
That bay the silent moon; speak, I conjure thee.
'Tis Merlin bids thee, at whose awful wand
The pale ghost quivers, and the grim fiend gasps.

Dryden's King Arthur, Act II, Scene I