Here is wisdom. Let him that has understanding count the number of the beast: for it is the number of a man; and his number is six hundred three score and six.
All Commentaries on Revelation 13:18 Go To Revelation 13
Victorinus of Pettau
AD 303
As they have it reckoned from the Greek characters, they thus find it among many to be τειταν, for τειταν has this number, which the Gentiles call Sol and Phœbus; and it is reckoned in Greek thus: τ three hundred, ε five, ι ten, τ three hundred, α one, ν fifty—which taken together become six hundred and sixty-six. For as far as belongs to the Greek letters, they fill up this number and name; which name if you wish to turn into Latin, it is understood by the antiphrase DICLUX, which letters are reckoned in this manner: since D figures five hundred, I one, C a hundred, L fifty, V five, X ten—which by the reckoning up of the letters makes similarly six hundred and sixty-six, that is, what in Greek gives τειταν, to wit, what in Latin is called DICLUX; by which name, expressed by antiphrases, we understand Antichrist, who, although he be cut off from the supernal light, and deprived thereof, yet transforms himself into an angel of light, daring to call himself light. Moreover, we find in a certain Greek codex αντεμος, which letters being reckoned up, you will find to give the number as above: α one, ν fifty, τ three hundred, ε five, μ forty, ο seventy, ς two hundred—which together makes six hundred and sixty-six, according to the Greeks. Moreover, there is another name in Gothic of him, which will be evident of itself, that is, γενσήρικος, which in the same way you will reckon in Greek letters: γ three, ε five, ν fifty, σ two hundred, η eight, ρ a hundred, ι ten, κ twenty, ο seventy, ς also two hundred, which, as has been said above, make six hundred and sixty-six.