Robert Fleming's First Principles of Apocalyptical Interpretation is a short defense of the Historicist Postmillennial position, which was held by all the best Puritans and Reformers.

It explains that Historicism deals with the great whore that rides the beast of Revelation as the symbolic representations referring to "the ecclesiastical government of the Papacy, or the apostate church of Rome," and the Roman Empire respectively. Holds to and defends a late date for the writing of the book of Revelation (which was the generally accepted position, concerning the dating of the book of Revelation, of early church for about the first three centuries after Christ).

This is the postscript, excerpted from Robert Fleming's complete treatise The Rise and Fall of the Papacy.