Offa's interventions in Kent in the mid-780s are connected to the subsequent exile of Egbert to Francia. The Chronicle claims that when Egbert invaded Kent in 825, the men of the southeast turned to him "because earlier they were wrongly forced away from his relatives". This is likely to be an allusion to Ealhmund, and may imply that Ealhmund had a local overlordship of the southeastern kingdoms. If so, Offa's intervention was probably intended to gain control of this relationship and take over the dominance of the associated kingdoms. The evidence for Offa's involvement in the kingdom of Sussex comes from charters, and as with Kent there is no clear consensus among historians on the course of events. What little evidence survives that bears on Sussex's kings indicates that several kings ruled at once, and it may never have formed a single kingdom. It has been argued that Offa's authority was recognised early in his reign by local kings in western Sussex, but that eastern Sussex (the area around Hastings) submitted to him less readily. Symeon of Durham, a twelfth-century chronicler, records that in 771 Offa defeated "the people of Hastings", which may record the extension of Offa's dominion over the entire kingdom. However, doubts have been expressed about the authenticity of the charters which support this version of events, and it is possible that Offa's direct involvement in Sussex was limited to a short period around 770–71. After 772, there is no further evidence of Mercian involvement in Sussex until c. 790, and it may be that Offa gained control of Sussex in the late 780s, as he did in Kent. East Anglia, Wessex and Northumbria In East Anglia, Beonna probably became king in about 758. Beonna's first coinage predates Offa's own, and implies independence from Mercia. Subsequent East Anglian history is quite obscure, but in 779 Æthelberht II became king, and was independent long enough to issue coins of his own. In 794, according to the Anglo-Saxon Chronicle, "King Offa ordered King Æthelberht's head to be struck off". Offa minted pennies in East Anglia in the early 790s, so it is likely that Æthelberht rebelled against Offa and was beheaded as a result. Accounts of the event have survived in which Aethelberht is killed through the machinations of Offa's wife Cynethryth, but the earliest manuscripts in which these possibly legendary accounts are found date from the 11th and