The official style of the Austenasian Monarch has been altered by Emperor Jonathan I.
Three of the titles in his official full style (which can be seen here, and is used only for formal ceremonial or diplomatic occasions) – “Emperor of Austenasia”, “Romanorum Imperator”, and “Basileus kai Autokrator Rhomaion” – have been merged into one: “Austenasian Emperor and Autocrat of the Romans”.
The idea that the Emperor of Austenasia is in some sense an heir or successor to the Roman Emperors was first officially taken up by Emperor Esmond III in March 2010, since which the Empire has adopted more and more Roman attributes (e.g. the names of military officers and units, a system of consuls, etc.). However, Austenasia first began to explicitly emulate Rome as early as November 2009, when the Imperial Diadem was modified to include pendilia (dangling chains emblematic of medieval Roman crowns).
A prefix, “by the Grace of Christ our God faithful”, has also been added to the Emperor’s style, adopted from the imperial style used by the late Eastern Roman Emperors. Jonathan I stated that this change was made to reflect his personal faith, with the changes to his style being made five years to the day that he joined the Orthodox Church.
The (ordinary) style of the Emperor now, then, is His Imperial Majesty Imperator Caesar Jonathan Augustus, by the Grace of Christ our God faithful Austenasian Emperor and Autocrat of the Romans.
The use of “our” in this style indicates the Emperor personally speaking (albeit in the majestic plural), not the implication that Christianity is in any way an official national religion of the Empire.