of Phaenebythis, a village in the Panopolite nome.[1] Grammarian. He taught in Alexandria and in Egypt, then in Constantinople under Theodosius. He wrote Names for Temples; a commentary on Sophocles, on Alcaeus, on Homer. He was a person famed for his expertise, and won no less renown than the most highly reputed grammarians of old.
An Egyptian,[2] in the time of the emperor Zeno. Nicomedes was searching for Harpocras,[3] and could not find him. Isidore the philosopher, when he learnt of this, sent a written message revealing the attackers. The messenger was captured, and acknowledged who it was that had sent him. They seized Horapollo and Heraiscus,[4] strung them up by their hands and asked after Harpocras and Isidore. Horapollo did not have the character of a philosopher, but kept hidden the belief about God that he held. Heraiscus had predicted that Horapollo would go over to the other side and abandon his ancestral customs; and this is what happened. Without any apparent compelling cause, he chose the change of his own accord, because of the hopes inspired by some insatiable desire - for there is nothing else one could easily invoke to defend the defection.
Apparently, he became a Christian.
Or perhaps the reverse.