Ah, a 12th‑century cipher, you say? That’s a delightful knot to untangle. I’ve spent more nights than I care to admit staring at those medieval margins, trying to coax meaning from the scribbles. The substitution is almost too tidy—almost like the hand wanted to be clever, but the notation’s off, you mentioned? That’s the kind of thing that tells you someone was trying to keep the code secret from a very specific audience. Grab the codex, bring me the folio, and let’s see if the scribe left a breadcrumb or two in the margins. You won’t believe how often a stray ink blot or a marginal note is the key to cracking the whole thing.