The East was then agitated by the advance of the Parthian Empire under the Sassanidae, and the Palmyrenes, in spite of their Roman honours and their Roman civilization, which did not really go much below the surface, were by no means prepared to commit themselves altogether to the Roman side.'
And in fact it is quite evident that a book which gives the division of the Sassanid Empire into four spahbehships in pure old Persian names cannot possibly have been composed at a long interval after the time of the Sassanidae.
In 226 the Parthian empire gave place to the new kingdom of the Sassanidae, whose claim to the ancient Achaemenian empire led to constant struggle with Rome in which Edessa naturally suffered.
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