King of East Anglia c759-779
According to William of Malmesbury it was one Aethelred who followed Beonna as king of the East Angles around the year 759. Other than that he was the father of the Aethelberht, of whom the Anglo-Saxon Chronicle later recorded as having been beheaded at the command of Offa, king of Mercia, nothing of great note is known of him.
King of East Anglia 876-879
There was also a second Aethelred who ruled East Anglia between the years 876 and 879 but merely as an agent of the Vikings whose authority represented the true power in the kingdom. His services were soon dispensed with as the Vikings in the form of Guthrum took the kingdom directly into their own hands.