Here's a good one...
Tertullian, died around 220 AD – Carthage, North Africa, wrote five books against Marcion and other works against Gnostics and other heresies. Tertullian understood that Mary and Joseph had a normal sexual relationship within marriage after Jesus was born and so the doctrine of the virgin birth of Christ is biblical and historical, but the “brothers and sisters of the Lord” are truly the children of Mary of Joseph. (see “On the Flesh of Christ”, chapter 23; On Monogamy, 8; and Against Marcion, 4:19)... Origen (254 AD), Basil (379 AD), and Chrysostom (407 AD) all denied that Mary was sinless.Irenaeus did not believe in the Perpetual virginity of Mary, as demonstrated in Against Heresies, 3:21:10 and 3:22:4.
Rome just makes things up.