The Powys-Mercia border was violently contested throughout the eighth century before Offa's Dyke was built. Chronicle references to battles along the upper Severn suggest repeated Welsh attempts to recover territory and Mercian efforts to push the border west. The construction of Offa's Dyke c.784 represents the formalisation of a contested frontier that had been fought over for generations. This entry represents the sustained border warfare of the early eighth century.
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