Hertfordshire was originally the area assigned to a fortress constructed at Hertford under the rule of Edward the Elder in 913. The name Hertfordshire appears in the Anglo-Saxon Chronicle in 1011.
The Domesday Book recorded the county as having nine hundreds. Tring and Danais became one, Dacorum. The other seven were Broadwater , Cashio , Edwinstree , Hertford , Hitchin and Odsey .
Hertfordshire is the starting point of the New River: a man made waterway, opened in 1613 to supply London with fresh drinking water.
Hertfordshire lost Barnet to Greater London in 1965, but gained Potters Bar and South Mimms from Middlesex.
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