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In page Buckinghamshire:

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The history of the area predates the Anglo-Saxon period and the county has a rich history starting from the Brittonic and Roman periods,[citation needed] though the Anglo-Saxons perhaps had the greatest impact on Buckinghamshire: the geography of the rural county is largely as it was in the Anglo-Saxon period. Later, Buckinghamshire became an important political arena, with King Henry VIII intervening in local politics in the 16th century, and just a century later the English Civil War was reputedly started by John Hampden in mid-Bucks.[1]