Mercia - Reign of Offa and Rise of Wessex

Reign of Offa and Rise of Wessex

After the murder of Æthelbald by one of his bodyguards in 757, a civil war broke out which was concluded with the victory of Offa. Offa was forced to build anew the hegemony over the southern English of his predecessor, and he did this so successfully that he became the greatest king Mercia had ever known. Not only did he win battles and dominate Southern England but also he took an active hand in administering the affairs of his kingdom by founding market towns and overseeing the first major issues of gold coins in Britain; he assumed a role in the administration of the Catholic Church in England (sponsoring the short-lived archbishopric of Lichfield), and even negotiated with Charlemagne as an equal. Offa is credited with the construction of Offa's Dyke, marking the border between Wales and Mercia.

Offa exerted himself to ensure that his son Ecgfrith of Mercia would succeed him, but after his death in July 796, Ecgfrith survived for only five more months, and the kingdom passed to a distant relative named Coenwulf in December 796. In 821, Coenwulf was succeeded by his brother Ceolwulf, who demonstrated his military prowess by his attack on and destruction of the fortress of Deganwy in Powys. The power of the West Saxons under Egbert was rising during this period, however, and in 825 Egbert defeated the Mercian king Beornwulf (who had overthrown Ceolwulf in 823) at Ellendun.

The Battle of Ellendun proved decisive. Beornwulf was slain suppressing a revolt amongst the East Angles, and his successor, a former ealdorman named Ludeca, met the same fate. Another ealdorman, Wiglaf, subsequently ruled for less than two years before being driven out of Mercia by Egbert. In 830, Wiglaf regained independence for Mercia, but by this time Wessex was clearly the dominant power in England. Wiglaf was succeeded by Beorhtwulf.