Cornelius Nepos
Some modern scholars have considered this Hagnon to be the same man as the demagogue Agnonides, the contemporary of Phocion, as the latter is in some manuscripts of Cornelius Nepos called "Agnon." But the manner in which Agnon is mentioned by Quintilian shows that he is a rhetorician, who lived at a much later period than the 4th century BC suggested by an identification with Agnonides. Whether he is the same as the Academic philosopher mentioned by Athenaeus is still a matter of some debate.