She partially described the language in a work titled Lingua Ignota per simplicem hominem Hildegardem prolata, which survived in two manuscripts, both dating to ca.
Ta esitas keele osalise kirjelduse teoses "Lingua Ignota per simplicem hominem Hildegardem prolata", millest on säilinud kaks käsikirja, mõlemad umbes aastast 1200.