Carl Wark (sometimes Carl's Wark) is a rocky promontory on Hathersage Moor in the Peak District National Park, just inside the boundary of Sheffield, England. The promontory is faced by vertical cliffs on all but one side, which is protected by a prehistoric embankment. The cliffs and embankment form an enclosure that has been interpreted as an Iron Age hill fort, though the date of construction and purpose of the fortifications remains unknown. The site is a scheduled monument.^[1]

The date and purpose of the construction of the rampart at Carl Wark are uncertain. It has been described as being "unlike any other [structure] found in Northern England."^[12] It is widely postulated to be a hill fort of Iron Age origin, perhaps dating from the 8th to the 5th centuries BC,^[13] though a similar enclosure at Gardom's Edge has been dated to the late Bronze Age, between 1300 and 900 BC.^[14] There is no evidence of settlement within the enclosure so it is unlikely that the site was used for a continuously occupied fort; it may have been used as a place of refuge for a population living in the surrounding area or it may have had some ceremonial purpose.^[14]

Antiquarian Hayman Rooke, writing in 1785, gave one of the earliest descriptions of the structure. He thought that it was built by the British Celtic peoples, and surmised that "it is natural to imagine, from the many sacred erections, that this place must have been intended for holy uses, or a court of justice".^[15] In 1861 historian John Gardner Wilkinson wrote that the site "bears the marked characteristics of an ancient British [Iron Age] fort",^[16] whilst antiquarian and barrow-digger Thomas Bateman stated that he thought the encampment had been set up as a defence against Constantine the Great during the Roman rule of Britain.^[17] Isaac Chalkley Gould also dismissed Rooke's idea that the enclosure had a sacred use, writing that it may have been used as a temporary fortified camp or refuge.^[18] Following a limited excavation of the turf embankment by Frank Gerald Simpson in 1950, Cecily Margaret Piggott concluded that the rampart was constructed in the Early Middle Ages possibly in the 5th or 6th century as it is similar in construction techniques to some ramparts of this period in Scotland.^[19] Some more recent historians agree with the view that the fortifications date from 'the Romano-British period at the start of the Dark Ages, maybe about 500 AD'.^[20] Norman Price (1953) described Carl Wark as the site of a pre-Roman Celtic British encampment, later used for defence in the 6th century by Arthurian knight Sir Lamoracke, who he states was also known as Llywarch.^[21] More recent assessments suggest that the site may have been in use since the Neolithic period,^[14] perhaps with multiple uses and phases of construction.^[22]

The origin of the name Carl Wark is uncertain. Rooke used the name "Cair's Work" in his 1785 description, whereas Bateman used "Carleswark". Sheffield historian and folklorist S. O. Addy, writing in 1893, posited that the name is Old Norse in origin, meaning 'The Old Man's Fort', where the 'Old Man' refers to the devil^[23]—suggesting that the 9th to 10th century Danish settlers in the area regarded the enclosure as ancient and mysterious.^[24][25] The 1802 Derbyshire edition of The Beauties of England and Wales refers to a rock on the site named "Cair's Chair"^[26] suggesting the Welsh word Caer meaning fort or rampart as a possible origin - Cair being an old spelling variant.^[27]

A scene from the 1987 film The Princess Bride was filmed nearby at Carl Wark with Higger Tor visible in the background.^[28]

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• Wincobank (hill fort)