Eusebius may refer here to the Simonians, an heretical sect (mentioned by Justin, Irenæus, Clement of Alexandria, and others), which recognized him as its founder and leader (though they originated probably at a later date), and even looked upon him as a God. They were exceedingly licentious and immoral. Their teachings gradually assumed a decidedly Gnostic character, and Simon came to be looked upon as the father of all Gnostics (compare Irenæus, I. 27. 4), and hence of heretics in general, and as himself the arch-heretic. Eusebius, therefore, perhaps refers in this place simply to the Gnostics, or to the heretics in general.