The petty Anglo-Saxon kingdoms of the early…
796 CE
The petty Anglo-Saxon kingdoms of the early settlement period have been consolidated by the end of the eighth century into four large ones: Wessex, Mercia, East Anglia and Northumbria.
Mercia has been dominant among the Anglo-Saxon kingdoms south of the river Humber for most of the eighth century.
Æthelbald, who had come to the throne in 716, had established himself as the overlord of the southern Anglo-Saxons by 731.
Assassinated in 757, he had been briefly succeeded by Beornred, but within a year Offa had ousted Beornred and taken the throne for himself.
Offa's daughter Eadburh had married Beorhtric of Wessex in 789, and Beorhtric had become an ally thereafter.
In Kent, Offa had intervened decisively in the 780s, and at some point became the overlord of East Anglia, whose king, Æthelred, had been beheaded in 794 at Offa's orders.
It had been suggested around 789 by Charles I of the Franks that his second son, Charles the Younger, should be married to Offa's daughter Ælfflæd.
Offa had insisted that the marriage could only go ahead if Charles's daughter Bertha was married to Offa's son Ecgfrith.
Charles had taken offense, broken off contact, and closed his ports to English traders.
Normal relations were reestablished eventually nand the ports were reopened.
Charlemagne and Offa just a few years later, in 796, conclude the first commercial treaty known in English history.
Offa appears to have moved to eliminate dynastic rivals to the succession of his son, Ecgfrith.
According to a contemporary letter from Alcuin of York, an English deacon and scholar who has spent over a decade as a chief advisor at the court of Charles I of the Franks, "the vengeance of the blood shed by the father has reached the son"; Alcuin added, "This was not a strengthening of the kingdom, but its ruin."
At Offa’s death on July 29, 796, Ecgfrith succeeds him but reigns for less than five months before Coenwulf comes to the throne.
The surviving sources do not record whether Ecgfrith died of natural causes or was assassinated, though Alcuin's letter seems to imply the latter.