Cornwall (; Cornish: Kernow [ˈkɛrnɔʊ] or [ˈkɛrnɔ]) is a ceremonial county in South West England. It is one of the Celtic nations and the homeland of the Cornish people. The county is bordered by the Atlantic Ocean to the north and west, Devon to the east, and the English Channel to the south. The largest urban area is the Redruth and Camborne conurbation.
The county is predominantly rural, with an area of 1,375 square miles (3,562 km2) and an estimated population of 585,655 in 2024. The county's major settlements include the city of Truro and St Austell in the centre, Redruth and Camborne adjacent to each other in the southwest, Saltash in the extreme southeast, and Penzance and Falmouth on the southern coast. For local government purposes, most of Cornwall is a unitary authority area, with the Isles of Scilly governed by a unique local authority. The Cornish nationalist movement disputes the constitutional status of Cornwall and seeks greater autonomy within the United Kingdom.
Cornwall is the westernmost part of the South West Peninsula, and the southernmost county within the United Kingdom. Its coastline is characterised by steep cliffs and, to the south, several rias, including those at the mouths of the rivers Fal and Fowey. It includes the southernmost point on Great Britain, Lizard Point, and forms a large part of the Cornwall National Landscape. The national landscape also includes Bodmin Moor, an upland outcrop of the Cornubian batholith granite formation. The county contains many short rivers; the longest is the Tamar, which forms the border with Devon.
Cornwall had a minor Roman presence, and later formed part of the Brittonic kingdom of Dumnonia. From the 7th century, the Britons in the South West increasingly came into conflict with the expanding Anglo-Saxon kingdom of Wessex, eventually being pushed west of the Tamar, where the boundary was set by King Æthelstan in 936. By the time of the Norman Conquest, Cornwall was administered as part of England, though it retained its own culture. The remainder of the Middle Ages and Early Modern Period were relatively settled, with Cornwall developing its tin mining industry and becoming a duchy in 1337. During the Industrial Revolution, the tin and copper mines were expanded and then declined, with china clay extraction becoming a major industry. Railways were built, leading to a growth of tourism in the 20th century. The Cornish language became extinct as a living community language at the end of the 18th century, but efforts to revive it were initiated in the 19th century.
The modern English name "Cornwall" is a compound of two terms coming from two different language groups:
"Corn-" originates from the Proto-Celtic term *kornu- ("horn", presumed in reference to "headland"), and is cognate with the English word "horn" and Latin "cornu" (both deriving from the Proto-Indo-European *ḱerh₂-). There may also have been an Iron Age group that occupied the Cornish peninsula known as the Cornovii (i.e. "people of the horn or headland").
"-wall" derives from wealh, an exonym in Old English meaning "foreigner", "slave" or "Brittonic-speaker" (as in Welsh).
In the Cornish language, Cornwall is Kernow which stems from the same Proto-Celtic root.
In later times, Cornwall was known to the Anglo-Saxons as "West Wales" to distinguish it from "North Wales" (the modern nation of Wales). The name appears in the Anglo-Saxon Chronicle in 891 as On Corn walum. In the Domesday Book it was referred to as Cornualia and in c. 1198 as Cornwal. Other names for the county include a latinisation of the name as Cornubia (first appears in a mid-9th-century deed purporting to be a copy of one dating from c. 705), and as Cornugallia in 1086.
Prehistory, Roman and post-Roman periods
Humans reoccupied Britain after the last Ice Age. The area now known as Cornwall was first inhabited in the Palaeolithic and Mesolithic periods. It continued to be occupied by Neolithic and then by Bronze Age people.
Cornwall in the Late Bronze Age formed part of a maritime trading-networked culture which researchers have dubbed the Atlantic Bronze Age system, and which extended over most of the areas of present-day Ireland, England, Wales, France, Spain, and Portugal.
During the British Iron Age, Cornwall, like all of Britain (modern England, Scotland, Wales, and the Isle of Man), was inhabited by a Celtic-speaking people known as the Britons with distinctive cultural relations to neighbouring Brittany. The Common Brittonic spoken at this time eventually developed into several distinct tongues, including Cornish, Welsh, Breton, Cumbric and Pictish.
The first written account of Cornwall comes from the 1st-century BC Sicilian Greek historian Diodorus Siculus, supposedly quoting or paraphrasing the 4th-century BCE geographer Pytheas, who had sailed to Britain:
The inhabitants of that part of Britain called Belerion (or Land's End) from their intercourse with foreign merchants, are civilized in their manner of life. They prepare the tin, working very carefully the earth in which it is produced ... Here then the merchants buy the tin from the natives and carry it over to Gaul, and after traveling overland for about thirty days, they finally bring their loads on horses to the mouth of the Rhône.
The identity of these merchants is unknown. It has been theorized that they were Phoenicians, but there is no evidence for this. Professor Timothy Champion, discussing Diodorus Siculus's comments on the tin trade, states that "Diodorus never actually says that the Phoenicians sailed to Cornwall. In fact, he says quite the opposite: the production of Cornish tin was in the hands of the natives of Cornwall, and its transport to the Mediterranean was organized by local merchants, by sea and then overland through France, passing through areas well outside Phoenician control." Isotopic evidence suggests that tin ingots found off the coast of Haifa, Israel, may have been from Cornwall. Tin, required for the production of bronze, was a relatively rare and precious commodity in the Bronze Age – hence the interest shown in Devon and Cornwall's tin resources. (For further discussion of tin mining see the section on the economy below.)
In the first four centuries AD, during the time of Roman dominance in Britain, Cornwall was rather remote from the main centres of Romanization – the nearest being Isca Dumnoniorum, modern-day Exeter. However, the Roman road system extended into Cornwall with four significant Roman sites based on forts: Tregear near Nanstallon was discovered in the early 1970s, two others were found at Restormel Castle, Lostwithiel in 2007, and a third fort near Calstock was also discovered early in 2007. In addition, a Roman-style villa was found at Magor Farm, Illogan in 1935. Ptolemy's Geographike Hyphegesis mentions four towns controlled by the Dumnonii, three of which may have been in Cornwall. However, after 410 AD, Cornwall appears to have reverted to rule by Romano-Celtic chieftains of the Cornovii tribe as part of the Brittonic kingdom of Dumnonia (which also included present-day Devonshire and the Scilly Isles), including the territory of one Marcus Cunomorus, with at least one significant power base at Tintagel in the early 6th century.
King Mark of Cornwall is a semi-historical figure known from Welsh literature, from the Matter of Britain, and, in particular, from the later Norman-Breton medieval romance of Tristan and Yseult, where he appears as a close relative of King Arthur, himself usually considered to be born of the Cornish people in folklore traditions derived from Geoffrey of Monmouth's 12th-century Historia Regum Britanniae.