() is described by Thucydides as commander of the
detachment of περίπολοι, or frontier guards, stationed at
Munychia, and as taking in this capacity a prominent part in the sedition against the Four
Hundred which Theramenes and Aristocrates excited in Peiraeeus, B. C.
411. Thucydides had just mentioned the assassination of Phrynichus by one of the
περίπολοι, and from a confusion perhaps of the two
passages comes the statement of Plutarch (Plut. Alc.
100.25), that the assassin was Hermon, and that he received a crown in honour of it.
Such a supposition is wholly inconsistent alike with the historian's narrative and the facts
mentioned by the orators. (Lys. c. Agorat. p. 492; Lycurgus, ad Leocr. p. 217.) It is hardly even a plausible hypothesis to identify him
with the commander of the περίπολοι, at whose house, it
appeared by the confession of an accomplice, secret meetings had been held. (Thuc. 8.92.) But he is probably the same who is mentioned in the
inscription (Böckh, Inscr. Graec. i. p. 221), which records the
monies paid by the keepers of the treasury of Athena in the Acropolis during the year
beginning at Midsummer B. C. 410. One of the earliest items is "to
Hermon for his command at Pylos." The place was taken no long time after, probably in the next
winter but one.