BURGRED, king of Mercia, succeeded to the throne in 852, and in 852 or 853 called upon ZEthelwulf of Wessex to aid him in subduing the North Welsh.
The request was granted and the campaign proved successful, the alliance being sealed by the marriage of Burgred to ZEthelswith, daughter of ZEthelwulf.
One naval engagement was certainly fought under ZEthelwulf (851), and earlier ones, possibly in 833 and 840.
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