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Under the Severan emperors there was a significant advance of the limits of territory under direct Roman occupation, in Mesopotamia to the river Tigris and in Africa to the northern fringes of the Sahara desert. Only in the later years of Severus Alexander, last of the Severan dynasty, were there indications of new threats to stability along the northern and eastern frontiers. The half-century between the death of Severus Alexander and the accession of Diocletian appears to have been dominated by inroads of peoples from the north and Persian aggression from the east. The years of stable relations with Germans and Sarmatians across the middle Danube came to an end around the middle of the third century. The general character of Roman frontier deployment in the European provinces has long been known but only recently have there emerged detailed accounts of the eastern frontier between the Black Sea and the Red Sea.
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