Sigered of Essex

One source is a charter issued by Egbert in 825, which grants land to a monastery in Rochester .

The charter mentions Sigered as “duke of the East Saxons”, and says that he consented to the grant along with other nobles.

[2] Another source states in the year 825, Egbert of Wessex “conquered the kingdom of Kent and Sussex and Surrey and Essex”.

This shows that Sigered surrendered his kingdom(duchy) to Egbert without a fight, and it talks about him being a vassal.

[3] However, another version of the Chronicle says that in the same year, Egbert “fought against Beornwulf and the Mercians at Ellendun”,[4] and then “sent his son Æthelwulf with an army into Kent” .