POD: 124- Hadrian fails negotiating a settlement with the Parthian King Osroes I and chooses to hold Mesopotamia, Assyria and Armenia. Rome invades the Parthian held Zagros Mountains, defending Mesopotamia, Assyria and Armenia from further Parthia Attacks. Under Hadrian, Rome develops a massive manned wall, similar to the Border created in Brittania. Parthia, No longer reaping the benefits of of Mesopotamia River vally per OTL, and already wracked by Noble infighting and nomadic incursions, accelerates Parthia fracturing, allowing various Vassal States to carve regions out for themselves. Over the next 200 years, the Early Christian Church, drawn by the richest of East begin to convert the people in the warring States of the middle east, creating the Church of the East. The Roman empire Splits, East and West (as in OTL), in 385 AD. As the Western Roman Empire surcumes to it's doom, the Eastern Empire survives (as in OTL) and begins to invade the various Middle Eastern warring states. Christian Missionaries go as far as China and begin to spread Christianity, having ripple affects throught society. And this is were I have no Clue what to do! Should the Greater Eastern ROman empire crush the Islamic Armies? With Romes focusing it's attention on the east, should the West fall faster? Comments would be appreciated!