History...here you go:
Evidence from History:
Pope Pius IX officially defined the doctrine of the Immaculate Conception in the year 1854. He did so with the understanding that this belief would help the Catholic faithful grow spiritually towards Christ. The belief that Mary was without sin was not "invented" as numerous people mistakenly think. Many are still under the false impression that the Immaculate Conception was not believed until the year 1854 when it was defined. What they fail to realize is that the belief itself has extremely strong roots in Church writings going well back into the 4th century.
"Every personal sin must be excluded from the Blessed Virgin Mary for the sake of the honor of God." - St. Augustine, 390 AD.
"Mary, a virgin not only undefiled but a virgin whom grace has made inviolate, free from every stain." - St. Ambrose of Milan, 340-370 AD.
"You, and your Mother are alone in this. You are wholly beautiful in every respect. There is in you, Lord, no stain, nor any spot in your Mother." - St. Ephraem, 350 AD.
In fact, there are literally dozens of cases where early Church fathers have mentioned Mary as being without sin, using such words as "All-Holy One," "All-Sinless One," and "Immaculate." It proves that the idea of Mary's sinlessness was not uncommon in the first few centuries of the Church. As time passed, the Eastern Church began to show its strong love for the Immaculate Conception with its own feast day beginning in the 8th to 9th century. By the 12th century, the Western Church was celebrating the feast of the Immaculate Conception all over Europe, and by the end of the 15th century, it was universally recognized and defended as true Christian doctrine.
Why Catholics Believe in the Immaculate Conception
Anything else?