E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Wraths Hole (Cornwall).
The legend is that Bolster, a gigantic wrath or evil spirit, paid embarrassing attention to St. Agnes, who told him she would listen to his suit when he filled with his blood a small hole which she pointed out to him. The wrath joyfully accepted the terms, but the hole opened into the sea, and the wrath, being utterly exhausted, St. Agnes pushed him over the cliff.