If it ever existed, the Middle Saxon kingdom had disappeared by the 7th century, and Surrey became a frontier area disputed between the kingdoms of Kent, Essex, Sussex, Wessex and Mercia, until its permanent absorption by Wessex in 825. Despite this fluctuating situation it retained its identity as an enduring territorial unit. During the 7th century Surrey became Christian and initially formed part of the East Saxon diocese of London, indicating that it was under East Saxon rule at that time, but was later transferred to the West Saxon diocese of Winchester. Its most important religious institution throughout the Anglo-Saxon period and beyond was Chertsey Abbey, founded in 666. At this point Surrey was evidently under Kentish domination, as the abbey was founded under the patronage of King Ecgberht of Kent. However, a few years later at least part of it was subject to Mercia, since in 673-5 further lands were given to Chertsey Abbey by Frithuwald, a local sub-king (subregulus) ruling under the sovereignty of Wulfhere of Mercia. A decade later Surrey passed into the hands of King Caedwalla of Wessex, who also conquered Kent and Sussex, and founded a monastery at Farnham in 686.
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