Mercian Supremacy

The Mercian Supremacy was the period of Anglo-Saxon history between c. 716 and c. 825, when the kingdom of Mercia dominated the Anglo-Saxon Heptarchy in England. Historian Sir Frank Stenton apparently coined the phrase, arguing that Offa of Mercia, who ruled 757–796, effectively achieved the unification of England south of Yorkshire. Scholastic opinion on the relationship between the kingdoms of Wessex and Mercia at this time remains divided.