Sigeberht was a West Saxon atheling (prince) who in 756 succeeded Cuthred as King of Wessex. in 756. After ruling a year he was accused of unlawful acts and removed from power by the . This council was led by Cynewulf. This same council then elected Cynewulf to replace Sigeberht as king. Sigeberht was allowed to keep Hampshire and was supported there by the Cumbra. But Sigeberht then killed Cumbra and as a result was driven out of Hampshire. Sigeberht met his end while wandering in the great forest of the , killed by a herdsman. The herdsman killed Sigeberht in revenge for killing Cumbra.