Prior to the third century A.D., two broad Roman conceptions of frontiers proliferated and competed: an imperial ideology of rule without limit coexisted with very real and pragmatic attempts to define and defend imperial frontiers. But from about A.D. 250-500, there was a basic shift in mentality, as news from and about frontiers began to portray a more defined Roman world--a world with limits--allowing a new understanding of frontiers as territorial...
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History