One of the earliest important Christian reflections on Mary compares her with Eve.
This is remarkable because it appears in the second century, not the medieval period.
What is the idea?
The biblical story begins with a virgin whose disobedience participates in humanity's fall.
Early Christians saw a corresponding pattern in Mary:
a virgin whose faithful obedience participates in the coming of Christ.
Mary does not replace Jesus.
Christ is the New Adam and Savior.
The Eve-Mary parallel places Mary's obedience within the story of Christ's saving work.
Justin Martyr
Justin Martyr, writing in the second century, compares Eve and Mary in his Dialogue with Trypho.
That makes Marian typology extraordinarily early.
Irenaeus
Irenaeus develops the comparison more fully in Against Heresies III.22.4, contrasting Eve's disobedience with Mary's obedience.
Primary source:
https://www.newadvent.org/fathers/0103322.htm
What does this prove?
It does not prove every later Catholic Marian dogma in one step.
It does demonstrate that theological reflection on Mary's role in salvation history was already present very early.
So the claim that Christians ignored Mary until medieval Catholicism invented devotion to her does not fit the evidence.
The better question
If Christians close to the Apostolic age were already interpreting Mary as a New Eve, how did that early insight develop through Christian history?
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