English: The earthwork has every appearance of being Saxon or Danish in origin with the exception of the north-east corner where there appears to be a Norman "motte and bailey" fortification known as Castle Toll.
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Possibly this is the unfinished ''Eorpeburnan'' mentioned in the Anglo Saxon Chronicle 892, which was attacked by the Danes. Castle toll is a motte like mound, which probably had a timber castle on it.it dates from early to mid 13th Century.