1) Welsh folklore 
Cythraul is an old Welsh word, still in everyday use, meaning `devil` or, with a capital letter, the Devil, probably deriving from Latin `Contrarius`, `the Opposer, Enemy`. Contr- would go to Welsh cythr- straightforwardly according to historical phonology, and the form `cythraul` not *cythraur is the result of dissimilation. It is likely ...