E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.
Montesinos (The Cave of).
Close to the castle of Rochafrida, to which a knight of the same name, who had received some cause of offence at the French court, retired. Tradition ascribes the river Guadia’na to this cave as its source, whence the river is sometimes called Montesinos.
