An early conlang

I was just reading _Medieval Children_ by Nicholas Orme, which tells me the
following (p. 154):

"The twelve-year-old Welsh schoolboy Eliodor, who claimed to have visited the
underworld in the early twelfth century, alleged that he learnt its speech
and used to repeat it to his listeners.  Years later, Gerald of Wales recorded
two of his phrases, 'Ydor ydorum' ('Bring water') and 'Halgein ydorum' ('Bring
salt')."

I presume that would be among the earliest conlangs of which we have some
record.

Doug

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