What would be the effects of Rome and Iran actually sticking to the Treaty of Perpetual Peace between Justinian and Khusrau (signed in 532)? Perhaps not really sticking to it for Eternity as was originally intended, but at least for a longer period of time? How could this happen? Could the Roman-Persian War in the 7th century not happen, and if so what are the effects on the birth of Islam and the Arab conquests (if they even happen)?