(Ἱππίας), captain of a company of Arcadian mercenaries in the service of Pissuthnes, is named by Thucydides in the story of the fifth year of the Peloponnesian War, B. C. 427. A faction of the Colophonians of Notium dependent on Persian aid introduced him into a fortified quarter of the town; and here, after the surrender of Mytilene, he was found and besieged by Paches, whose succour was demanded by the exiles of the other party. Paches, under a promise of a safe return into the fortification if no terms should be agreed on, drew Hippias out to a conference; retained him, while, by a sudden attack, the place was carried; and satisfied the letter of his promise by bringing him back into the fortress, and there shooting him to death. (Thuc. 3.34.)