The question of whether King Arthur was a real person has been discussed by both scholars and writers. Many people believe he existed, but most experts today think he was more of a mythical or traditional figure.

The earliest clear reference to Arthur appears around 828 in a text called the Historia Brittonum. It describes him as a military leader who fought against the Saxons in Britain during the 5th or 6th century at the Battle of Badon. This event was mentioned more than 300 years before the text was written. Arthur became a famous character in stories about Britain, especially after the 12th century, when Geoffrey of Monmouth wrote a book called Historia Regum Britanniae, which included many fictional details about him.

Historians suggest that the story of Arthur may have come from real people or events. Some theories include a 6th-century Scottish king named Artuir mac Áedán, a Roman-British leader named Ambrosius Aurelianus who resisted the Saxons, a Roman soldier named Lucius Artorius Castus from the 2nd century, and a 5th-century British king named Riothamus who fought with Gallo-Roman forces in Gaul. Other names linked to the legend include Welsh kings such as Owain Danwyn, Enniaun Girt, and Athrwys ap Meurig.

Historiography

Until the late 20th century, historians and archaeologists debated whether King Arthur was a real person. In the 21st century, most scholars now believe he was not a real historical figure.

In the early 1900s, Charles Oman noted that some historians, like James Henry Ramsay, believed Arthur was not real. However, Oman was unsure and thought there might be a real person behind the Historia Brittonum, a historical text.

In 1936, R. G. Collingwood and J. N. L. Myres described Arthur as a Roman official called a comes Britanniarum. They said Arthur’s historicity was unlikely to be questioned, but they separated the real Arthur from the legendary one.

In 1971, Leslie Alcock claimed there was enough evidence to suggest Arthur was a real person, not just a myth. At the same time, Frank Stenton noted that Gildas, a 6th-century writer, did not mention Arthur. Stenton suggested Arthur might have been less important in real life than in stories, but he still believed Arthur belonged in history. In the same year, John Morris supported Arthur’s existence, but his work was criticized for having serious flaws. David Dumville disagreed, arguing there was no historical proof of Arthur and that he should not be included in history books.

By 1986, Myres, who had previously supported Arthur’s historicity, said it was unlikely Gildas would have ignored Arthur if he had been real. He also noted that Arthur had consumed much of historians’ time. By 1991, a reference book on the Dark Ages stated that most historians believed Arthur was a real person, though they saw him as a minor figure. The chivalric version of Arthur, however, was created by Geoffrey of Monmouth in the 12th century.

In 2003, Thomas Charles-Edwards wrote about the period but only mentioned Arthur in the context of a Welsh story. In 2004, Francis Pryor said there was no proof Arthur existed, but also said it was impossible to prove he did not. In 2007, O. J. Padel described Arthur as a "legendary warrior and supposed king of Britain." In 2014, he said Arthur might have been either historical or legendary, but noted that a 10th-century Welsh poem did not mention Arthur among ancient heroes.

In 2007, Howard Wiseman said the evidence about Arthur allows, but does not require, belief in his existence. He also emphasized the need for better understanding of the period. In 2011, Robin Fleming’s history of the time did not mention Arthur. In 2013, Guy Halsall said scholars now mostly believe Arthur was not real. In 2018, Nicholas J. Higham dismissed claims about Arthur’s historicity, saying stories about him are based on "highland mist" rather than real events. His book was well-received.

In 2018, Tom Shippey said modern historians avoid discussing King Arthur. In 2019, Brian David noted that few topics in late antique and medieval history cause as much frustration as the idea of a real King Arthur. He added that scholars stopped debating Arthur’s historicity by the 1980s, and now the topic is mostly found in popular media.

In 2015 and 2020, Andrew Breeze argued Arthur was real and claimed to identify the locations of his battles and his death. However, other scholars disagreed with his conclusions.

Etymology of "Arthur"

The origin of the name Arthur is not clearly known. One possible explanation is that it comes from the Roman family name Artorius, which also has an unclear and debated origin, possibly linked to the Messapic or Etruscan languages. Some scholars have observed that the name of the legendary King Arthur appears in early Latin texts as Arthur, Arthurus, or Arturus, but never as Artōrius. Although the Classical Latin name Artōrius became Arturius in some Vulgar Latin dialects, this may not explain the origin of the name Arthur, as Artōrius would typically become Art(h)ur when used in Welsh.

Linguist and Celticist Stefan Zimmer suggested that Artorius might have a Celtic origin, possibly being a Latin version of the hypothetical name Artorījos, which could mean "Son of the Bear" or "Warrior-King" (the "i̯" represents the sound [j]). While Arto-rīg-i̯os is not found in historical records, the root *arto-rīg- is connected to the Old Irish personal name Artrí.

John Morris argued that the name Arthur appearing in records of Scottish and Welsh people suggests it became popular in Britain during the early 6th century for a short time. He proposed that this popularity might be linked to a real person named Arthur who briefly ruled as Emperor of Britain. He also suggested that this period may have temporarily stopped the movement of Saxon people, which later resumed in the 570s.

Early sources

Arthur is not named in Gildas' 6th-century book De Excidio et Conquestu Britanniae. Gildas does describe a British victory over the Saxons at the "Badonic mount" (mons Badonicus), which happened in the year of his birth and brought a period of peace between the two groups. This event is now called the Battle of Badon. Gildas refers to the battle as happening "in our times" and calls it one of the "latest, if not the greatest" battles against the Saxons. He also notes that a new generation of people born after Badon had grown up in Britain. Later sources, such as the Annales Cambriae, use the Old Welsh name "Badon" for the battle's location, a name most modern scholars accept.

Gildas' Latin writing is difficult to understand; he does not name Arthur or any other leader of the battle. However, he mentions Ambrosius Aurelianus as a powerful enemy of the Saxons before the Battle of Badon, suggesting some time passed between Ambrosius' victory and the Battle of Badon. The details of the battle, including its exact date and location, are still uncertain. Most scholars believe it occurred around the year 500, though many places in Britain have been proposed as the site.

Arthur is also not named in Bede's Historia ecclesiastica gentis Anglorum (written around 731) or any other surviving works until around 829, when the Historia Brittonum was written by a Welsh religious leader named Nennius. This text states: "Then in those days Arthur fought with the kings of the Britons against the Saxons, but he himself was the commander of battles (dux bellorum)." It lists twelve battles led by Arthur. Historian Nicholas Higham notes that earlier texts describe Arthur only as a warrior or leader of warriors, whether real or supernatural. Later, during the Middle Ages, Arthur was increasingly seen as a king, as leading armies was a king's role in that time.

The earliest version of the Annales Cambriae (Welsh Annals) was written in the mid-10th century. It records the Battle of Badon as happening in 516 and lists Arthur's death as occurring in 537 at the Battle of Camlann. Like the Annales, all other sources that mention Arthur were written at least 400 years after the events they describe.

Arthur appears briefly in William of Malmesbury's Gesta Regum Anglorum ("Deeds of the Kings of the English") from 1124. This work aimed to piece together British history by combining accounts from Gildas, Bede, Nennius, and other writers. It treated Arthur as a historical figure and linked him to Ambrosius Aurelianus, suggesting Ambrosius may have been Arthur's employer. Malmesbury also mentions the discovery of a tomb believed to belong to "Walwin," a supposed nephew of Arthur, during the time of William the Conqueror.

Arthur was first called a king of the Britons in Geoffrey of Monmouth's Historia Regum Britanniae (History of the Kings of Britain), written around 1136. Geoffrey also describes Ambrosius Aurelianus (whom he names Aurelius Ambrosius) as a king of Britain and an older brother of Uther Pendragon, Arthur's father. This established a family connection between Ambrosius and Arthur. Geoffrey identifies Aurelius Ambrosius as the son of Constantinus, a Breton ruler and brother of Aldroenus.

Arthur is mentioned in several 12th- to 13th-century religious writings about Welsh and Breton saints, including those of Cadoc, Carannog, Gildas, Goeznovius, Illtud, and Paternus. The Legenda Sancti Goeznovii, a story about the Breton saint Goeznovius, was once thought to date to around 1019 but is now believed to be from the late 12th or early 13th century. It includes a short mention of Arthur and a leader named Vortigern.

There are references to a legendary hero named Arthur in early Welsh and Breton poetry. These poems are preserved in medieval manuscripts and are hard to date precisely. Most are believed to be from the 9th to 10th centuries, though some scholars suggest they may be as old as the 7th century. The oldest known example is the Old Welsh poem Y Gododdin, written in a 13th-century manuscript. It mentions a warrior who "glutted black ravens [killed many men] on the rampart of the stronghold, although he was no Arthur."

The Welsh poem Geraint, son of Erbin describes a battle at a coastal settlement and mentions Arthur briefly. It is a poem praising and mourning King Geraint, a historical ruler of Dumnonia, and shows that Arthur was associated with him at an early date. The poem also includes the earliest known use of the title "emperor" for Arthur. Geraint, son of Erbin is found in the Black Book of Carmarthen, compiled around 1250, though the poem itself may be older, dating to the 10th or 11th century. Y Gododdin was copied around the same time. The two poems differ in their use of archaic language, with Y Gododdin being older in form. This difference may reflect when the poems were last revised to keep them understandable, as language would have changed over time.

Alternative candidates for the historical King Arthur

Some theories suggest that the name "Arthur" was a nickname for real people who lived in history.

One theory says that Lucius Artorius Castus, a Roman military leader who worked in Britain around the late 2nd or early 3rd century, might have inspired the story of King Arthur. Artorius is known from two stone carvings that describe his military service. After serving as a centurion in the Roman army for many years, he was promoted to a high-ranking officer in the Legio VI Victrix, a Roman unit based in Eboracum (modern-day York, England). Later, he led two British legions on a military campaign against either the Armoricans (in modern-day Brittany, France) or the Armenians. After that, he became a civilian governor of Liburnia, a region in modern-day Croatia, where he died.

In 1924, Kemp Malone first connected Artorius to King Arthur. He noted that the Welsh name "Arthur" might come from the Latin name "Artorius." Malone suggested that parts of Artorius’ life, such as his possible campaign in Brittany and his eventual retirement from the military (perhaps due to an injury), might have influenced stories about King Arthur written by Geoffrey of Monmouth. Later scholars disagreed with this idea, arguing that Artorius lived two to three centuries before the time usually linked to Arthur and that the similarities between their stories are not clear.

Malone’s idea was not widely accepted for many years. It was revived in the 1970s as part of a theory called the "Sarmatian connection." In 1975, Helmut Nickel suggested that Artorius was the original Arthur and that a group of Sarmatian soldiers who served under him in Britain inspired the Knights of the Round Table. Nickel wrote that Castus’ Sarmatian unit used a red dragon banner and that their descendants remained in Britain in the 5th century. He also pointed out similarities between the Arthurian legend and traditions from the Sarmatians and other groups in the Caucasus region. He believed that these descendants kept Castus’ legacy alive and mixed it with their own myths about magical objects like cauldrons and swords.

At the same time, C. Scott Littleton developed a more detailed version of the Sarmatian connection. In 1978, Littleton and Anne C. Thomas wrote about the theory, and in 1994, Littleton and Linda Malcor expanded on it in a book titled From Scythia to Camelot. They argued that Artorius and the Sarmatian soldiers he led inspired King Arthur and his knights. They also said that many parts of Arthur’s story, such as the Sword in the Stone, the Holy Grail, and the return of Arthur’s sword to a lake, might come from myths of the Caucasus region, which were brought to Britain by Sarmatians and Alans in the 2nd century. They found similar stories in the traditions of the Caucasus and connected Arthur and his knights to heroes like Batraz and the Narts from North Caucasus legends.

Some scholars believe the Sarmatian connection has some value, but others think it is based on guesses and weak evidence. Many of the traditions used to support the theory are not clearly linked to the Sarmatians and come from oral stories that were not recorded until the 19th century. Also, many of the strongest similarities between Arthur’s story and these traditions appear in later stories from the 12th century or later, not in earlier British sources. This would mean the traditions had to survive in Britain for over 1,000 years after the Sarmatians arrived. Despite this, the Sarmatian connection remains popular, as seen in the 2004 film King Arthur.

Riothamus (also spelled Riotimus) was a real person described by ancient writers as "a king of the Britons." He lived in the late 5th century, and most of what is known about him comes from the writings of the Byzantine historian Jordanes, who wrote The Origin and Deeds of the Goths in the mid-6th century, about 80 years after Riothamus’ death.

Around 460, a Roman diplomat named Sidonius Apollinaris wrote a letter to Riothamus asking for help to calm unrest among the Brettones, a group of Brittonic-speaking people living in Armorica (modern-day Brittany, France). This letter still exists today. In 470, the Western Roman Emperor Anthemius asked Riothamus for help against the Gothic revolt led by Euric, king of the Visigoths. Jordanes wrote that Riothamus traveled across the ocean to Gaul with 12,000 soldiers to help the Bituriges, likely near Avaricum (modern-day Bourges). However, Riothamus’ location was betrayed by Arvandus, the jealous governor of Gaul, and Euric defeated him in the Battle of Déols. Riothamus was last seen fleeing northwest to Burgundy.

Geoffrey Ashe noted that Arthur, as described by Geoffrey of Monmouth, is said to have crossed into Gaul twice: once to help a Roman emperor and once to end a civil war. Riothamus did both, assuming he was a king in Britain and Armorica. Arthur is also said to have been betrayed by an adviser, just as Riothamus was betrayed by an ally. The Arthurian stories also say that Arthur was taken to Avalon (called insula Auallonis by Geoffrey of Monmouth) before his death. Riothamus, after his defeat at Déols, was last seen fleeing to the Germanic Burgundians, possibly passing through a town called Avallon, which was in Burgundian territory near Bourges.

It is unclear whether Riothamus was a king in Britain or Armorica. Armorica was a Brittonic colony, and Jordanes wrote that Rioth