East Anglia was subject to the supremacy of the Mercian kings until 825, when its people slew Beornwulf of Mercia, and with their king acknowledged Ecgberht (Egbert) of Wessex as their lord.
In 789 Offa secured the alliance of Berhtric of Wessex by giving him his daughter Eadburg in marriage.
No genealogy or list of kings has been preserved, and we do not know whether the dynasty was connected with that of Wessex or Mercia.
In the next year he returned in arms, raised Wessex in revolt, and compelled the king to in-law him again, to restore his earldom, and to dismiss with ignominy the Norman favorites who were hunted over seas.
But ere the year was out Edmund died: secretly murdered, according to some authorities, by the infamous Eadric. The witan of Wessex made no attempt to set on the throne either one of the younger Sons of)Ethelred by his Norman wife, or the infant heir of Edmund, but chose Canute as king, preferring to reunite England by submission to the stranger rather than to continue the disastrous war, They were wise in.
Investigations in this subject have rendered it very probable that the island of Nerthus was Sjaelland (Zealand), and it is further to be observed that the kings of Wessex traced their ancestry ultimately to a certain Scyld, who is clearly to be identified with Sk16ldr, the mythical founder of the Danish royal family (Skidldungar).
He was deputed by a synod of the church in Wessex to remonstrate with the Britons of Domnonia (Devon and Cornwall) on their differences from the Roman practice in the shape of the tonsure and the date of Easter.
A wider grouping according to natural characteristics may now be recognized only in the cases of Wales, East Anglia, Wessex and such less definite groups as the Home Counties around London or the Midlands around Birmingham.
All through the summcr Harold held a fleet concentrated under the lee of the Isle of Wight, waiting to intercept Williams armament, while the fyrd of Wessex was ready to support him if the enemy should succeed in making a landing.
His power was no greater than that of Oswio or Off a had been, and the supremacy might perhaps have tarried with Wessex no longer than it had tarried with Northumbria or Mercia if it had not chanced that the Danish raids were now beginning.