In the PAPY-L list today there was an announcement of a papyrus codex, found among the finds of a Belgian museum. It’s been carbon dated to the 11th century, and is thought to be local, and probably containing a Latin text. A number of other papyrus codices are known from the medieval period in that region, it seems. Details of the find are here in various languages including English, with pictures. It consists of about 100 pages and measures roughly 14 x 13 cm. No writing is visible, but maybe something can be seen after the book has been opened. It is, of course, very fragile!