On November 1, 1950, Pope Pius XII defined the Assumption of Mary to be a dogma of faith: “We pronounce, declare and define it to be a divinely revealed dogma that the immaculate Mother of God, the ever Virgin Mary, having completed the course of her earthly life, was assumed body and soul to heavenly glory.” The pope proclaimed this dogma only after a broad consultation of bishops, theologians and laity. There were few dissenting voices. What the pope solemnly declared was already a common belief in the Catholic Church.
We find homilies on the Assumption going back to the sixth century. In following centuries, the Eastern Churches held steadily to the doctrine, but some authors in the West were hesitant. However by the 13th century there was universal agreement. The feast was celebrated under various names—Commemoration, Dormition, Passing, Assumption—from at least the fifth or sixth century. Today it is celebrated as a solemnity.