E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Ca’cus.
A famous robber, represented as three-headed, and vomiting flames. He lived in Italy, and was strangled by Hercules. Sancho Panza says of the Lord Rinaldô and his friends, “They are greater thieves than Cacus.” (Don Quixote.)
