The dominant Anglo-Saxon kingdom of the English Midlands during the 7th and 8th centuries, reaching its height under Offa who built the famous dyke marking the Welsh border.
Lost its remaining independence in 918 when Edward the Elder removed the 'Lady of the Mercians' Ælfwynn from power in December 918 and took direct control of Mercia, absorbing it into the expanding English kingdom.
Covers Mercia in the context of the Anglo-Saxon kingdoms — verified via Open Library.
Primary-source annals of Anglo-Saxon England recording Mercian supremacy and the reign of Offa.