What stationery item was first made from bread and leather?

Here's how it worked:

* Bread: A thick, flat piece of bread was used as the writing surface. The soft, slightly moist surface allowed for easy writing with a stylus or other pointed tool.

* Leather: A thin sheet of leather was used as a cover for the bread tablet. This protected the writing surface and also allowed for folding and carrying.

These "bread and leather" tablets were common in ancient times, particularly in ancient Rome.