And there appeared another sign in heaven; and behold a great red dragon, having seven heads and ten horns, and seven crowns upon his heads.
All Commentaries on Revelation 12:3 Go To Revelation 12
Victorinus of Pettau
AD 303
Now, that he says that this dragon was of a red colour— that is, of a purple colour— the result of his work gave him such a colour. For from the beginning (as the Lord says) he was a murderer; and he has oppressed the whole of the human race, not so much by the obligation of death, as, moreover, by the various forms of destruction and fatal mischiefs. His seven heads were the seven kings of the Romans, of whom also is Antichrist, as we have said above.
And ten horns. He says that the ten kings in the latest times are the same as these, as we shall more fully set forth there.