The Ad Novatianum (To Novatian) is an anonymous letter (or a treatise in the form of a letter) addressed to the schismatic leader Novatian, likely written between 250 and 260 CE, during Novatian’s active years. It is a rebuke of schism and of the rigorism that set Novatian apart from his prominent contemporaries, particularly Cornelius of Rome (Cornelius [Bishop of Rome]) and Cyprian of Carthage. This rebuke takes the form largely of arguments from Scripture in favor of the mercy of God…