Parthia would be weaker. Mesopotamia would remain part of the Roman empire. The Talmud would never get written. More great classics would get written. The parts of Germania that Ammianus Marcellus states had agriculture would join the Roman empire. The Goths would be a footnote in history. Instead of over relying on barbarian mercenaries, Roman legions would be the main force that repels the Huns. Rome has a philosopher that surpasses Marcus Aurelius, reaching an equivalent status to Plato and Aristotle. Rome sends diplomats to China when the Tang dynasty is founded. From the Tang, Rome adopts paper money. Rome also learns to use gunpowder from the tang. Consequently, alchemy flourishes. Rome travels the seas to find exotic resources and people. The Azores are discovered. Like otl, salt is traded for gold in west Africa, but instead of camels, ships are used. Finally, Rome becomes a colonial empire. Gunpowder, and other resources of alchemical significance drive colonial expansion. Some population expansion into far flung colonies occurs as well.