The pseudo-Athanasian De Trinitate Libri XII and the Johannine Comma

Back on April 19, 2025 I published a new post under the title: Victor of Vita, the council of Carthage (484), the Book of the Catholic Faith, and the Johannine Comma (link). The thread delved into the history and controversy between two competing factions of professing Christians in North Africa—the homoians and homoousians—during the middle through late fifth century. This controversy between the homoians and homoousians began a full century earlier with promulgation of the Second Creed of Sirmium in 357 A.D.—also known as "The Blasphemy of Sirmium" (link).

Recently, my studies into the controversy between the homoians and homoousians has been renewed with my reading of Daniel H. Williams, Ambrose of Milan and the End of the Arian-Nicene Conflicts (link). Chapter 3, "Homoians and Anti Homoians: North Italy" (pages 69-103) is excellent; and in pages 96-103 Dr. Williams relates a fourth century apologetic work on the Trinity I had no memory of being mentioned in any my previous readings—De trinitate libri XII. From the pen of Dr. Williams we read:

Since the seventeenth century, the work commonly known as the De trinitate libri XII had been attributed to either Vigilius of Thapsus or Athanasius of Alexandria, since the latter's name appears as the author in the earliest and majority of manuscripts. Just before the turn of this century, careful manuscript studies by G. Ficker and G. Morin, showed that neither Vigilius nor Athanasius could have been the author, and that the most ancient and numerous manuscripts contain only seven books, not the twelve which Chifflet had compiled. While there does exist a longer recension which includes an eighth book, it is generally agreed that the first seven form a cohesive ensemble attributable to a single author. The latter five books are a comparatively recent agglomeration of treatises, noticeably different from the first seven in style and terminology. This consensus is reflected in the recent critical edition of the De trinitate (CCSL ix. 3-99), in which V. Bulhart treats books I-VII as a literary whole and prints the first (or shorter) and second recensions in parallel columns. But here the consensus ends. Regarding the questions of authorship and chronology for the De trinitate, scholarly opinion has been and continues to be sharply divided. With the publication of the CCSL edition (1957), Bulhart revived the view that Eusebius of Vercelli was the author of the first seven books (the first recension). [Pages 96-97]

He then writes:

Because of the imposing difficulties with the chronology and authorship of De trinitate, the contents of the treatise have been left virtually untreated by modern scholarship...As we shall see, the De trinitate provides one of the most informative glimpses into the evolution of Latin pro-Nicene literature, with the exception of those writings from Hilary and Ambrose. [Page 98]

After reading Dr. Williams book, I became somewhat obsessed with learning more about this "virtually untreated" work . I began with gathering information on the proposed authors of De trinitate libri XII: "Psuedo-Athanasius", "Vigilius of Thapsus", "Eusebius of Vercelli" and "Gregory of Elvira". Whilst engaged in some research on Vigilius of Thapsus, I discovered he is mentioned in one of the commentaries on 1 John that I own; note the following:

In PL 62, 237—334 there is a work De Trinitate consisting of twelve books. Formerly it was attributed to the North African bishop Vigilius of Thapsus who was present at the Carthage meeting; it has also been designated Pseudo-Athanasius; but other guesses credit it to a Spanish scholar such as Gregory of Elvira (d. 392) or Syagrius of Galicia (ca. 450). Recently the first seven books have been published (CC 9, 3—99) as the work of Eusebius of Vercelli (d. 371), but not without debate (see CPL #105). In any case, the work is probably of North African or Spanish origin; and its parts may have been composed at different times, e.g., Books 1—7 written just before 400, and 8—12 at a period within the next 150 years. In Books 1 and 10 (PL 62, 243D, 246B, 297B) the Comma is cited three times. (Raymond Brown, The Epistles of John, Appendix IV, 1982, p. 782)

Now, whoever actually wrote De trinitate libri XII—formerly attributed to Vigilius of Thapsus—the author(s), in defense of pro-Nicene Trinitarianism, cited the Johannine Comma. The following are the germane Latin texts from Migne’s Patralogia Latina, Volume 62 that were referenced by Brown (PDF):

Liber I 206 dirente Joanne evangelista in Epistola sua : Tres sunt qui testimonium dicunt in cælo, Pater, et Verbum, et Spiritus, et in Christo Jesu unum sunt (I Joan. v, 7) [Migne PL 62, p. 243D; Bulhart CCSL 9, p. 15]

English: John the Evangelist in his Epistle asserts: Three are they who bear witness in heaven, the Father, the Word, and the Spirit, and in Christ Jesus they are one

Liber I 209 Jam audisti superius evangel stam Joannem in Epistola sua tam absolute testantem : Tres sunt qui testimonium dant in cælo, Pater, Verbum et Spiritus sanctus : et in Christo Jesu unum sunt (I Joan. v, 7). [Migne PL 62, p. 246B; Bulhart CCSL 9, p. 19]

English: We have heard the superior gospel from John in his Epistle as absolute testimony: There are three that bear witness in heaven, the Father, the Word, and the Holy Ghost: and in Christ Jesus they are one

Liber X 281 et Joannes in Epistola sua ait : Tres sunt qui testimonium dicunt in cælo, Pater, Verbum et Spiritus : et in Christo Jesu unum sunt (I Joan. v, 7) [Migne PL 62, p.297B; Bulhart CCSL 9, p. 145]

English: and John in his Epistle says: There are three that bear witness in heaven, the Father, the Word, and the Spirit: and in Christ Jesus they are one

In addition to  the three citations referenced by Brown, I found a fourth citation of 1 John 5:7 in De trinitate libri XII:

Liber V 249 sicut Joannes evangelista in Epistola sua tam absolute testatur : Et tres unum sunt (I Joan. v, 7). [Migne PL 62, p.274C; Bulhart CCSL 9, p. 77]

English: just as John the Evangelist testifies so absolutely in his Epistle: And the three are one.

Now, most Patristic scholars are in agreement with Dr. Williams that only the first seven books of De trinitate libri XII were written by the same author, and that they were penned earlier than the other five. Following Bulhart’s assessment that it was Eusebius of Vercelli who wrote the first seven books, we have three clear citations of the Johannine Comma—in support of Nicene Trinitarianism—a full century before that of Victor of Vita.

Shall end this post with a Google AI Overview of Eusebius of Vercelli that I found useful:

Saint Eusebius of Vercelli (c. 300-371 AD) was a 4th-century Italian bishop, a staunch defender of orthodox Nicene Christianity against Arianism, known for establishing the first community of clergy living a monastic, communal life, and for enduring exile for his faith. Born in Sardinia, he became the first recorded bishop of Vercelli, unifying clerical and monastic ideals by having priests live together in piety, and bravely resisted Arian bishops at the Council of Milan, leading to his persecution and exile to the East. He returned after Emperor Julian's amnesty, working with St. Athanasius and Hilary of Poitiers to restore Catholic doctrine before his death in 371.

Addendum (12-23-25):

New Catholic Encyclopedia, Volume 5, p. 455 (Second Edition - 2003)

EUSEBIUS OF VERCELLI, ST.

Bishop, monastic founder, and anti-Arian polemicist; b. Sardinia, Italy, early fourth century; d. Vercelli, August 1, 371. He became a member of the Roman clergy under Pope JULIUS. When consecrated first bishop of Vercelli c. 344, he established a community life for his clergy, and he is considered a founder of the CANONS REGULAR. He was also instrumental in the establishment of new dioceses near Vercelli, e.g., Turin and Embrun. Eusebius attended the Council of Milan in 355 as legate of Pope LIBERIUS and with Dionysius of Milan upheld the orthodoxy of St. ATHANASIUS against the politically intimidated Western episcopate. He was exiled in the East until the death of CONSTANTIUS II, was liberated under Julian, and in 362 attended the Council of Alexandria with Athanasius and approved its lenient decisions for the reconciliation of compromised bishops. Returned to Italy, he collaborated with HILARY OF POITIERS against the Arians; he died peaceably in his own diocese. Of his correspondence correspondence, three letters have been preserved, and the first seven books of a De Trinitate previously attributed to Athanasius or Vigilius of Thapsus are now ascribed to him by many patrologists. He also translated Commentaries on the Psalms by EUSEBIUS OF CAESAREA (Jerome, Ep. 61.2), now lost, and may have authored the pre- Jerome version of the Gospels preserved in the Codex Vercellensis.

Feast: Aug. 2 (formerly Dec. 16, anniversary of his consecration). [V. C. DE CLERCQ] 

Grace and peace,

David

Victor of Vita, the council of Carthage (484), the Book of the Catholic Faith, and the Johannine Comma

In 484 A.D. an unusual council of bishops was convened by the Vandal king Huneric (also spelled Huniric and Hunirix) in Carthage North Africa. The Germanic Vandals had conquered most of North Africa west of Alexandria, taking control of the region from the Roman empire, and establishing Carthage as its capital in 439 A.D. The Vandals had converted to Christianity before leaving Hispania (i.e. the Iberian Peninsula) in 429 A.D for North Africa, though the form of Christianity they had embraced was Homoianism, not Catholic Homoousianism.

By 484 A.D. this region of North Africa had been under Homoian Vandal rule for over four decades, but the majority of Christians remained Catholic. As such, of the hundreds of bishops that attended the 484 A.D. council, the vast majority—461 according to Heffle*—were Catholic bishops.

Recently, I was able to obtain John Moorheads’s English translation of an extensive historical document that provides the proceedings of this council, and the events leading up to it—Victor of Vita’s, History of the Vandal Persecution (Google Books; Scribd pdf).

The first book of Victor's tome is a chronicle of the Vandal invasion of North Africa under the leadership of their king Geiseric. 

The second book begins with the death of Geiseric and succession to the throne by his eldest son, Huniric. Concerning Huniric's rule, Victor writes:

First of all the tyrant decreed, in a dreadful command, that no-one could hold an office in his palace or carry out public duties without becoming an Arian. (Victor of Vita: History of the Vandal Persecution, English translation John Moorhead - Liverpool University Press, 1992, Book II, chapter 23, p. 32)

In chapter 26 he relates the following:

But with what floods of tears shall I proceed? He sent bishops, priests, deacons and other members of the church, to the number of 4,966, to exile in the desert Among them were very many who had gout, and others who had lost their worldly sight through age. Among their number was the blessed Felix, bishop of Abbir (Henchir el-Khandaq), who had then been a bishop for 44 years; having been struck with the disease of paralysis he did not feel anything, nor was he capable of speech. (Ibid. p.33)

An edict from Huniric/Hunirix is provided in chapter 39:

"Hunirix, king of the Vandals and Alans, to all the homousian bishops. It is well known that not once but quite often your priests have been forbidden to celebrate any liturgies at all in the territory of the Vandals, in case they seduce Christian souls and destroy them. Many of them have despised this and, contrary to the prohibition, have been discovered to have said mass in the territories of the Vandals, claiming that they hold to the rule of the Christian faith in its fullness. And because we do not wish for scandal in the provinces granted us by God, therefore know that by the providence of God and with the consent of our holy bishops we have decreed this: that on the first of February next you are all to come to Carthage, making no excuse that you are frightened, so that you will be able to debate concerning the principles of faith with our venerable bishops and establish the propriety of the faith of the Homousians, which you defend, from the divine scriptures. From this it will be clear whether you hold the faith in its fullness. We have sent a copy of this edict to all your fellow bishops throughout Africa. Given on 20 May 483 in the seventh year of Hunirix." (Ibid. pp. 37-38)

From the above edict we learn that Hunirix [Huniric] has decreed that “all the homousian bishops” are to meet on February 1, 484 A.D. in Carthage “to debate concerning the principles of faith with our venerable bishops and establish the propriety of the faith of the Homousians, which you defend, from the divine scriptures.”

A few chapters later, Victor penned the following:

52 That day of treachery which the king had appointed, 1 February, was now drawing near. There came together not only the bishops of the whole of Africa, but also those of many of the islands, worn out with suffering and grief. Silence was observed for many days, until he separated every skilled and learned man from among them, so that they could be put to death on the basis of false charges. For he committed to the flames one of that choir of the learned, whose name was Laetus. a vigorous and most learned man, after he had long endured a squalid imprisonment. He thought that making an example of him would strike fear into the others and enable him to wear them down.

53 Finally the debate took place, needless to say at a place their enemies had selected. Our people chose to avoid the disturbances which loud voices would have caused, in case the Arians were later to say that they had been overpowered by weight of numbers, and chose ten of their number who would answer on behalf of them all. Cyrila, with his lackeys, most arrogantly placed a throne for himself in a high place, while our people were standing. And our bishops said: "It is always pleasant to be at a meeting at which the exaltation of power does not proudly hold sway, but general consent is arrived at, so that the truth is recognized from what the judges decree, in accordance with the actions of the parties. But who is to be the judge on this occasion, who will weigh the evidence so that the scales of justice may confirm what has been argued well or show unsound propositions to be false?"

54 While these and other things were being said, the king's notary answered: "The patriarch Cyrila has named some people." Our people, abominating the proud and unlawful title which he had usurped, said: "Read out to us who gave permission for Cyrila to take this title for himself!" At this our enemies made a loud clamour and began to bring false accusations. And because our people had sought that, if the throng of sensible people were not allowed to ask questions, they could at least look on, the order was given that all the children of the catholic church who were present were to be beaten with a hundred blows each. Then blessed Eugenius began to cry out: "May God see the violence we endure, let him know the affliction we suffer from the persecutors!"

55 Our people turned round and said to Cyrila: "Say what you intend to do." Cyrila said: "I do not know Latin." Our bishops said: "We know very well that you have always spoken Latin; you should not excuse yourself now, especially since you have set this fire going." And, seeing that the catholic bishops were better prepared for the debate, he flatly refused to give them a hearing, relying on various quibbles. But our people had foreseen this and written a short work concerning the faith, composed quite fittingly and with the necessary detail. They said: "If you wish to know our faith, this is the truth we hold."

THE BOOK OF THE CATHOLIC FAITH

56 We are enjoined by a royal command to provide an account of the catholic faith which we hold. So we are setting out to indicate briefly the things which we believe and proclaim, aware of our lack of ability but supported by divine assistance. We recognize, then, that the first thing we must do is give an explanation of the unity of the substance of the Father and the Son, which the Greeks call homousion.

Therefore: we acknowledge the Father, the Son and the Holy Spirit in the unity of the divine nature in such a way that we can say with a faithful confession that the Father subsists as a distinct person, and the Son equally exists in his own person, and that the Holy Spirit retains the distinctiveness of his own person, not asserting that the Father is the same as the Son, nor confessing that the Son is the same as the Father or the Holy Spirit, nor understanding the Holy Spirit in such a way that he is the Father or the Son; but we believe the unbegotten Father and the Son begotten of the Father and the Holy Spirit proceeding from the Father to be of one substance and essence, because the unbegotten Father and the begotten Son and the Holy Spirit who proceeds have one divine nature in common; nevertheless, there are three distinct persons.

57 A heresy arose and brought forth something new against this catholic and apostolic faith. It maintained that the Son was not born of the substance of the Father but came into being from no existing things, that is, out of nothing. To refute and completely destroy this wicked profession which had come forth against the faith, a Greek word, homousion, was coined. This means 'of one substance and essence,' and signifies that the Son was not born from no existing things nor from any substance, but of the Father. Therefore, whoever thinks that the word homousion is to be laid aside wishes to assert that the Son came to exist out of nothing. But if the Son is not 'of nothing,' he is without doubt of the Father, and rightly homousion, that is, of one substance with the Father.

58 That he is of the Father, that is, of one substance with the Father, is demonstrated by these testimonies. The apostle says: 'who, while he is the brightness of his glory and the figure of his substance, also upholds all things by the word of his power.' (Heb 1:3) [Ibid. pp. 43-45]

This apologia for the Catholic Faith continues for another 43 chapters (pp. 45-63). It contains dozens of supporting Scriptural quotes, including the Johannine Comma of 1 John 5:7,8. Note the following:

82 And so, no occasion for uncertainty is left. It is clear that the Holy Spirit is also God and the author of his own will, he who is most clearly shown to be at work in all things and to bestow the gifts of the divine dispensation according to the judgment of his own will, because where it is proclaimed that he distributes graces where he wills, servile condition cannot exist, for setvitude is to be understood in what is created, but power and freedom in the Trinity. And so that we may teach the Holy Spirit to be of one divinity with the Father and the Son still more clearly than the light, here is proof from the testimony of John the evangelist. For he says: 'There are three who bear witness in heaven, the Father, the Word and the Holy Spirit, and these three are one.' Surely he does he not say 'three separated by a difference in quality' or 'divided by grades which differentiate, so that there is a great distance between them?' No, he says that the 'three are one.' (Ibid. p. 56)

THE BOOK OF THE CATHOLIC FAITH ends with:

101 This is our faith, confirmed by evangelical and apostolic traditions and authority, and founded on the association of all the catholic churches which are in this world; in which faith we trust and hope we shall remain, by the grace of almighty God, until the end of this life. Amen.

This is the end of the book sent on 20 April by Januarius of Zattara (Kef Benzioune) and Villaticus of Casae Medianae, bishops of Numidia, and Boniface of Foratiana and Boniface of Gratiana, bishops of Byzacena. (Ibid. p. 63)

And with the ending the Catholic defense, I shall end this post…

Grace and peace,

David 

*Charles Joseph Heffle, History of the Councils - Vol. IV, A.D. 451 to  A.D. 680, 1895, p. 36.