| Old Sarum | |
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 Aerial view of Old Sarum | |
  Old Sarum Location within Wiltshire | |
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| Region | |
| Country | England |
| Sovereign state | United Kingdom |
Old Sarum, in Wiltshire, South West England, is the ruined and deserted site of the earliest settlement of Salisbury. Situated on a hill about two miles (three kilometres) north of modern Salisbury near the A345 road, the settlement appears in some of the earliest records in the country. It is an English Heritage property and is open to the public.
The great stone circles of Stonehenge and Avebury were erected nearby and indications of prehistoric settlement have been discovered from as early as 3000 BC. An Iron Age hillfort was erected around 400 BC, controlling the intersection of two trade paths and the Hampshire Avon. The site continued to be occupied during the Roman period, when the paths were made into roads. The Saxons took the British fort in the 6th century and later used it as a stronghold against marauding Vikings. The Normans constructed a motte and bailey castle, a stone curtain wall, and a great cathedral. A royal palace was built within Old Sarum Castle for King Henry I and was subsequently used by Plantagenet monarchs. This heyday of the settlement lasted for around 300 years until disputes between the Sheriff of Wiltshire and the Bishop of Salisbury finally led to the removal of the church into the nearby plain. As New Salisbury grew up around the construction site for the new cathedral in the early 13th century, the buildings of Old Sarum were dismantled for stone and the old town dwindled. Its long-neglected castle was abandoned by Edward II in 1322 and sold by Henry VIII in 1514. Edward Rutherfurd's 1987 novel Sarum traces the history of the town.
Although the settlement was effectively uninhabited, its landowners continued to have parliamentary representation into the 19th century, making it one of the most notorious of the rotten boroughs that existed before the Reform Act of 1832. Old Sarum served as a pocket borough of the Pitt family.
Old Sarum is also the name of a modern settlement north-east of the monument, where there is a grass strip airfield and a small business park, and large 21st-century housing developments.