By serious I mean somewhat complete, with a working grammar. So the examples in Gulliver's Travels are probably not really "languages" (or are they, I'm not sure).

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Baleybelen (~14c?) is often considered as the oldest well-documented a priori conlang. Much older than Solresol (1827). Unfortunately, I know no Turkish so I can't really tell what the content. The Wiki page say that, akin to Lingua Ignota, Baleybelen is thought to be a religion-motivated or language for poetry (maybe related to Sufism?). But unlike Lingua Ignota which borrowed most of its structure and vocabulary from Latin, Baleybelen is thought to be an a priori language.

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