E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Peter and John de Carvajal, being condemned to death on circumstantial evidence, appealed without success to Ferdinand IV. of Spain. On their way to execution they declared their innocence, and summoned the king to appear before God within thirty days. Ferdinand was quite well on the thirtieth day, but was found dead in his bed next morning. (See WISHART.)