Who is she who rises resplendent, all pure, and bright as the sun?
There is no mention of the Dormition or Assumption in the New Testament, only in apocryphal sources, but it is one of the earliest feast observed in the church. The feast of the Dormition dates at least from the 5th C. It was always celebrated in Jerusalem on this date, whilst in some other parts of the Eastern church the date varied. In the 7th C, the Byzantine emperor, Maurice decreed that the Dormition be celebrated everywhere on the 15th. Later the Western Church adopted the same date, but always kept it simply as the Assumption.