Even after the A.D. 325 Council of Nicaea, at least for a while Augustine too seems to have held this view. Also the A.D. 450 Church Father Theodoret of Cyrrhus agreed with it. Theodoret's words (in Exodum 3) are: “The whole passage shows that it was God Who appeared to him [Moses].
But he called Him an ‘angel’ [alias a ‘messenger’] in order to let us know that it was not God the Father Whom he saw – for whose ‘angel’ could the Father be? – but the Only-begotten Son, the Angel of great Counsel” alias Christ as the ‘Angel’ or Messenger of the Covenant in Malachi 3:2.