(Feast of the). The 15th of August, so called in honour of the Virgin Mary, who (according to the Roman and Greek Churches) was taken to heaven that day (A.D. 45), in her corporeal form, being at the time seventy-five years of age.
This seems very improbable, if Christ was crucified A.D. 33. It would make Mary survive her son twelve years, and to have been thirty years old at his birth instead of about fifteen.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894