In the Orthodox church, the koimesis, or dormition ("falling asleep"), of the Virgin began to be commemorated on August 15 in the 6th century. The observance gradually spread to the West, where it became known as the feast of the Assumption. It was not until the 13th century, the belief was accepted by most Catholic theologians.
The Assumption of Sophia is a Gnostic belief that predates the Assumption of Mary by 300 years.