The Immaculate Conception is a dogma of the Catholic Church maintaining that Mary was kept free of original sin from her moment of conception and is not to be confused with the virginity of Mary or the virgin birth of Jesus.
Great teachers of the Church from at least the fourth century spoke of Mary as having remained a virgin throughout her life:
Athanasius (Alexandria, 293 - 373)
Epiphanius (Palestine, 315? - 403)
Jerome (Stridon, present day Slovenia, 345? - 419)
Augustine (Numidia, now Algeria, 354 - 430)
Cyril (Alexandria, 376 - 444)
Martin Luther(lutheran church) was one of the biggest defenders of this concept.