Hermias (or Hermeias) was a Neoplatonist philosopher who was born in Alexandria c. 410 AD. He went to Athens and studied philosophy under Syrianus. He married Aedesia, who was a relative of Syrianus, and who had originally been betrothed to Proclus, but Proclus broke the engagement off after receiving a divine warning. Hermias brought Syrianus' teachings back to Alexandria, where he lectured in the school of Horapollo, receiving an income from the state. He died c. 450 AD, at a time when his children, Ammonius and Heliodorus, were still small. Aedesia, however, continued to receive an income from the state, in order to raise the children, enabling them to become philosophers.
A Commentary on the Phaedrus written by Hermias survives. It consists of notes based on the lectures conducted by Syrianus concerning Plato's Phaedrus.
A Christian writer towards the close of the second century, a native of Galatia, who has left a short discourse in ridicule of the pagan philosophers, entitled Διασυρμὸς τῶν ἔξω Φιλοσόφων. It appears to be an imitation of a discourse of Tatian's, but it is an imitation by a man of ability. He ridicules the want of harmony that prevails among the systems of the Greek philosophers, which is the cause of all their speculations being crowned with no positive result.