TSR Wiki > Study Help > Subjects and Revision > Revision Notes > History > Rome and the East 370–640 - Key Points
- Interdependence Byzantium and Sassanian Persian Empire that meant West and East drifted apart.
- Justinian wars of reconquest doomed to failure as broke symbiotic relationship with Persia in the Fertile Crescent 5th century. War east and west – weakened both B and SP helped triumph Islam early 7th.
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