The so-called "Mercian Supremacy" dominated the 8th century, though it was not constant. Aethelbald and Offa, the two most powerful kings, achieved high status; indeed, Offa was considered the overlord of south Britain by Charlemagne. His power is illustrated by the fact that he summoned the resources to build Offa's Dyke. However, a rising Wessex, and challenges from smaller kingdoms, kept Mercian power in check, and by the early 9th century the "Mercian Supremacy" was over.
The so-called "Mercian Supremacy" dominated the 8th century, though it was not constant. Aethelbald and Offa, the two most powerful kings, achieved high status; indeed, Offa was considered the overlord of south Britain by Charlemagne. His power is illustrated by the fact that he summoned the resources to build Offa's Dyke. However, a rising Wessex, and challenges from smaller kingdoms, kept Mercian power in check, and by the early 9th century the "Mercian Supremacy" was over.