Paths to Decipherment

[pjburkshire]

If you are imagining a language isolate that could have been spoken enough to make it into the manuscript by 1438 but is utterly unknown with no trace now, that language isolate would also have to have very unusual properties from other language families.  This seems low probability.

Unless the entire community and all their creations were intentionally obliterated by the Spanish Inquisition or some similarly motivated group intent on total extermination of the heresy of anti-Christian Zodiacs and naked women.