Both the title of the episode and the invocation spoken by the character of Sammael refer to four of the nine choirs of angels in Christian mythology.
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Rosier does not appear in the Bible (or Apocrypha), and is not mentioned in the Catholic Encyclopedia or Britannica, but Rosier is recognized in esoteric tradition as a fallen angel (specifically a Dominion of the Second Sphere), and is considered the patron demon of tainted love and seduction.