Feast of the Assumption

The commemoration of the death of the Blessed Virgin Mary (the Dormition, or falling asleep, as it was known in the East) is known as the Assumption because of the tradition that her body did not decay but that she was raised up, body and soul, into heaven. This tradition was already present in the sixth century; by the beginning of the twentieth century it was widespread (for details, see this article in the Catholic Encyclopaedia); and after a poll of bishops all over the world, the Pope formally and infallibly declared the doctrine of the Assumption to be part of the authentic and ancient doctrine of the universal Church. (See also the consultative document Deiparae Virginis Mariae – On the Possibility of Defining the Assumption as a Dogma of the Church).

from Universalis