Mercian Supremacy
Kingdom of MerciaThe Mercian Supremacy was the period of Anglo-Saxon history between c.626 and c.825, when the kingdom of Mercia dominated the Anglo-Saxon Heptarchy. While the precise period during which the Mercian Supremacy existed remains uncertain, the end of the era is generally agreed to be around 825, following the defeat of King Beornwulf at the Battle of Ellandun (near present-day Swindon).