Frederick George Meeson Beck, 1911 Encyclopædia Britannica, Volume 9… (1911)
“ The violent death of Selred, king of Essex, is mentioned in the Saxon Chronicle under the year 746; but we have no more information of historical importance until the defeat of the Mercian king Beornwulf in 825, when Essex, together with Kent, Sussex and Surrey, passed into the hands of Ecgbert, king of Wessex. After 825 we hear of no more kings of Essex, but occasionally of earls. About the year 870 Essex passed into the hands of the Danes and was left to them by the treaty between Alfred and Guthrum. ”
