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Any description of the eastern frontier must start with a discussion of the relationship between Rome and Persia. During most of the reign of Yezdegerd I (399-420) and in the first years of Theodosius II (408-50), relations between Rome and Persia were marked by a policy of mutual tolerance. In the fourth century the Arab nomad forces, 'Saracens', as they are called in the contemporary literature, became an important factor in the warfare between Rome and Persia to an extent previously unknown. The Jews in Palestine and the Diaspora had enjoyed a considerable degree of autonomy under Roman rule from the second century onward. The military organization of the second half of the fourth century had more in common with that of the sixth than with that of the third. This period witnessed the institution of territorial commands held by duces as distinct from the field arm.
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