>Indeed, if you're not old-fashioned enough to say `yn y Gymraeg' >it is certainly `yn Gymraeg' (``yn Gymraeg y mae'r eigion yn eu >dweud o don i don''), and the `understood article' argument is the >more convincing for that it would be `yng Nghymraeg' if it were >part of an utterance like `yng Nghymraeg y Beibl' (in /the/ language >of the Bible) where no definite article could possibly be required >to mark the definiteness of the `Cymraeg'. (y Gymraeg, Cymraeg y >Werin, Cymraeg Gwerin y Graith... and so on.) The only reason I was thinking that 'yn Gymraeg' might be an adverbial phrase like 'yn dda' is that in Latin the way you say 'in X' where X is a language is to make the adjective denoting the language into an adverb (by giving it an -e ending). Hence 'in Latin' = 'Latine'; 'in English' = 'Anglice'; 'in Welsh' = 'Cambrice', etc.