The Appendix Probi ("Probus' Appendix") is the conventional name for a series of five documents believed to have been copied in the seventh or eighth century in Bobbio, Italy.[1] Its name derives from the fact that the documents were found attached to a copy of the Instituta Artium, a treatise named after (but probably not written by) the first-century grammarian Marcus Valerius Probus.[2]