A kind of mediæval drama, the characters and events of which were drawn from sacred history.
or Mysterium. Said to make up the number 666 referred to in Rev. xvii. 5. This would not be worthy notice, except for the fact that the word “mystery” was, till the time of the Reformation, inscribed on the Pope's mitre.
Almost any phrase or long name can be twisted into this number. (See Number Of The Beast.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894