Late Antiquity was an eventful period on the eastern frontier of the Roman empire. From the failure of the Emperor Julian's invasion of Persia in 363 AD to the overwhelming victory of the Emperor Heraclius in 628, the Romans and Persians were engaged in almost constant conflict. This book, sequel to the volume covering the years 226-363 AD, provides translations of key texts on relations between the opposing sides, taken from a wide range of sources. Many have never before been available in a modern language, and all are fully set in context with expert commentary and extensive annotation