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Essex, one of the kingdoms of Anglo-Saxon England; i.e., that of the East Saxons. An area of early settlement, it probably originally included the territory of the modern county of Middlesex; London was its chief town. Archaeological discoveries suggest that many of the new settlers were continental Saxons. Essex sometimes had joint kings, and from 664 they were subject to the rulers of the midland kingdom of Mercia. From 825 Essex was controlled by Wessex,...