During the 5th and 6th centuries Surrey was conquered and settled by Saxons. In the 7th century, it became a frontier area disputed between the kingdoms of Kent, Essex, Sussex, Wessex and Mercia, until its permanent absorption by Wessex in 825.

After the Battle of Hastings, the Norman army advanced through Kent into Surrey, where they defeated an English force which attacked them at Southwark, before proceeding westwards on a circuitous march to reach London from the north-west. During King John’s struggle with the barons, Magna Carta was issued in June 1215 at Runnymede in Surrey.