Within the 4th century, there is a lot of evidence among the Fathers for the widespread belief in this doctrine.
Indeed. Aside from Tertullian we see a consensus of the early Church all believed in virginitas in partu (physical miracalous virginity through childbirth) and virginitas post partum (no marital relations of any kind). St. Hilary of Poitiers was insistent on this point of view in his writings and referred to those who promulgated a teaching contrary to her perpetual virginity as being irreligious individuals, utterly divorced from spiritual teaching. (Haffner, Paul. The Mystery of Mary. Chicago, IL: Liturgy Training, 2004/2008) .
If The Church (both East and West) was not absolutely sure of this teaching it would NEVER have risked making it a de fide teaching (required belief). This belief is ever present in the historical liturgies that we have in our archives.
This belief is present in Catholic art and some of this art even depicts Salome, an important figure in the Protoevangelium of James, who is severely punished by God for personally trying to examine Mary to witness to her post birth virginity (which immediately reminds us of the hapless Uzzah OT servant being struck dead for touching the arc of the covenant).
Origen , in his Commentary on Matthew (c. 248), expressly states belief in Mary’s perpetual virginity. In the words of Luigi Gambero, “Origen not only has no doubts but seems directly to imply that this is a truth already recognised as an integral part of the deposit of faith.” [11] In this context, Origen interpreted the comments of Ignatius of Antioch (d. c 108) as significant:
In a letter of the martyr Ignatius, “second bishop of Antioch after Peter[12]
who fought with the wild beasts during the persecution in Rome”. *Mary’s virginity was hidden from the prince of this world, hidden thanks to Joseph and her marriage to him. Her virginity was kept hidden because she was thought to be married. *[13]
From the fifth century on no opposition whatever to the doctrine was expressed in either East or West until modern times.
Even many of the Protestant Reformers accepted this as fact (Calvin, Luther, Zwingli, Wesley et-al). The Reformer’s followers are the one’s who in desperation to keep the defunct teaching of sola scriptura afloat have to sacrifice Mary’s virginity to hold to the principal that nothing can be held true concerning Christianity unless it is in the Bible - EVEN AGAINST WHAT EVERYONE BELIEVED AND WANTED TO BELIEVE!
Thus Protestants fall on their own sword of rebellion to spite themselves just to hold to a false doctrine in opposition to what they loved and held true as is shown in the following:
Diarmaid MacCulloch , a historian of the Reformation, wrote that the reason why **the magisterial reformers upheld Mary’s perpetual virginity, and why they had a “genuinely deep reverence and affection” toward Mary, was that she was “the guarantee of the Incarnation of Christ”, a teaching that was being denied by the same radicals that were denying Mary’s perpetual virginity. **[35] However, the absence of clear Biblical statements expressing the doctrine, in combination with the principle of sola scriptura , kept references to the doctrine out of the Reformation creeds and, together with the tendency to associate veneration of Mary with idolatry [36] and the rejection of clerical celibacy [37] led to the eventual denial of this doctrine among Protestants, who, thus uncommitted to a doctrine the perpetual virginity, take the “brothers” (ἀδελφοί) οf Jesus mentioned in the New Testament most naturally (but not certainly) to be children of Mary and thus Jesus’ half brothers, rather than his cousins or stepbrothers from a postulated previous marriage of Joseph. [38]
In Eastern Iconography Mary’s perpetual virginity is signified by three stars that appear on her left, her right, and above her or on her head, which represent her virginity before, during and after giving birth.
But I think the best proof comes from an exegesis and projection of sentiments from St. Irenaeus’ argument for the Virgin Birth in his work
Against Heresies (circa 165 A.D.). This man was at a deep spiritual insight of the scriptural meaning of the virgin birth and it becomes almost child’s play (viz the virginal Incarnation) to see that these same principals he used in arguing for the balancing the ancient wrongs of Eve committed as virgin in sin/disobedience had to be offset by the new Eve, Mary, as a virgin in obedience! Further since the wrong was an eternal offense the remedy had to be an eternal correction since the principal of Justice MUST extend to eternity. In essence, because God is Eternal, the eternal equations for Divine Justice DEMANDED a supernatural and perpetual obedience of a perpetual virgin to remedy Eve’s sin! QED - MARY HAD to be perpetual virgin to offset Eve’s virginal transgression for all of time and space. The insight offered through Irenaeus’ imagery in the NT is profound when one starts to notice that Jesus as new Adam is offsetting the ancient evil committed by Adam through The Tree of the Knowledge of Good and Evil is carried on Jesus’ shoulder on the Tree of Life (the cross). As Adam and Eve were shamed in their virginal nakedness Jesus as pure unblemished virgin walks naked through the path to Calvary NAKED but WITHOUT SHAME since He has committed no evil and knows not the shame that Adam did. The correspondence is profound and should axiomatically prove the concept of a divine balance is valid and to make a believer out of anyone who can perceive this seamless divine balancing act. No one could invent this stuff through 2,000 years of prophecy and history!
We can quite nearly prove through induction that Mary HAD to be ever virgin in the fullest and most complete sense for all eternity.
James