How The Early Christians Viewed Theophanies

This is from a note on section 2:27 of Ernest Evans' edition of Tertullian's Against Marcion, found here. I haven't studied this subject much, but I think Evans' point would have some significance even if he overestimates the popularity of the view in question to some extent:

"It was almost universally held, until the end of the fourth century, that the subject of the theophanies, the speaker of divine words throughout the Old Testament, was God the Son acting as the agent or messenger of the Father: Justin, dial. 56 sqq.; Tertullian, adv. Prax. 14-16; Eusebius, H.E. i. 2; Prudentius, Apotheosis (passim)."