The Oath of Iron, also known as the Maschenan Concordat, was the treaty reached in the year 53 AF between the Empire of Gwenith and Maschenya that annexed Maschenya and the Maschenan Territories into the Gwenithen Empire. It established the two religions policy, allowing the Maschenans to practice their traditional religion in addition to Versatianism. It declared Maschenya a Special Province of the Gwenithen Empire and allowed for the administaration of the Maschenan Territories by ... rather than Ahnren.