Morten St George Theory

[-JKP-]

Keep looking, Morten. They are out there.

Well, JP, they are definitely not in the Lexicon Abbreviaturarum, a book of more than six hundred pages packed full of medieval Latin abbreviations, nor can I detect a "m9" combined as superscript in any of the nine depictions that you showed us.

MORTEN, the one on the bottom right is a COMBINED SUPERSCRIPT. It is the superscript t plus superscript 9. Another scribe would combine m9 the same way this scribe combined t9. It just depends which language they are thinking in when they write it, Latin or their own language. Ordinals are slightly different in different languages. Just as we use 4th and 1st in English, they use different ordinal suffixes in French, German, Italian, Czech or Latin.

Instead of insisting it's some kind of coded message, why don't you just ask yourself, which language uses this style of ordinal? You would get a better answer.