Ambrosius Aurelianus was a war leader of the Romano-British who won an important battle against the Anglo-Saxons in the 5th century, according to Gildas. He also appeared independently in the legends of the Britons, beginning with the 9th-century Historia Brittonum. Eventually he was transformed by Geoffrey of Monmouth into the uncle of King Arthur, the brother of Arthur's father Uther Pendragon, as a ruler who precedes and predeceases them both. He also appears as a young prophet who meets the tyrant Vortigern; in this guise, he was later transformed into the wizard Merlin.
Magnus Maximus was Roman emperor in the western portion of the Empire from 383 to 388. He usurped the throne from emperor Gratian in 383 through negotiation with emperor Theodosius I.
Uther Pendragon, also known as King Uther, is a legendary king of sub-Roman Britain and the father of King Arthur. A few minor references to Uther appear in Old Welsh poems, but his biography was first written down in the 12th century by Geoffrey of Monmouth in his Historia Regum Britanniae, and Geoffrey's account of the character was used in most later versions. He is a fairly ambiguous individual throughout the literature, but is described as a strong king and a defender of his people.
In the Matter of Britain, Igraine is the mother of King Arthur. Igraine is also known in Latin as Igerna, in Welsh as Eigr, in French as Ygraine, in Le Morte d'Arthur as Ygrayne—often modernised as Igraine or Igreine—and in Parzival as Arnive. She becomes the wife of Uther Pendragon, after the death of her first husband, Gorlois.
Cassivellaunus was a historical British military leader who led the defence against Julius Caesar's second expedition to Britain in 54 BC. He led an alliance of tribes against Roman forces, but eventually surrendered after his location was revealed to Julius Caesar by defeated Britons.
Leir was a legendary king of the Britons whose story was recounted by Geoffrey of Monmouth in his pseudohistorical 12th-century History of the Kings of Britain. According to Geoffrey's genealogy of the British dynasty, Leir's reign would have occurred around the 8th century BC, around the time of the founding of Rome. The story was modified and retold by William Shakespeare in his Jacobean tragedy King Lear.
Cunedagius was a legendary king of the Britons, as recounted by Geoffrey of Monmouth. He was the son of Henwinus, Duke of Cornwall, and Regan, the daughter of King Leir.
Historia regum Britanniae, originally called De gestis Britonum, is a pseudohistorical account of British history, written around 1136 by Geoffrey of Monmouth. It chronicles the lives of the kings of the Britons over the course of two thousand years, beginning with the Trojans founding the British nation and continuing until the Anglo-Saxons assumed control of much of Britain around the 7th century. It is one of the central pieces of the Matter of Britain.
In Arthurian legend, Gorlois of Tintagel, Duke of Cornwall, is the first husband of Igraine, whose second husband is Uther Pendragon. Gorlois's name first appears in Geoffrey of Monmouth's Historia Regum Britanniae. A vassal of Ambrosius Aurelianus, his arrival at the Battle of Kaerconan ensures the defeat of Hengist. In Wace's Roman de Brut, when Hengist's son Octa and his cousin Ossa rebel, Gorlois helps Uther defeat them at York.
Eudaf Hen is a figure of Welsh tradition. He is remembered as a King of the Britons and the father of Elen Luyddog and Conan Meriadoc in sources such as the Welsh prose tale The Dream of Macsen Wledig and Geoffrey of Monmouth's Latin chronicle Historia Regum Britanniae. He also figures into Welsh genealogies. Geoffrey of Monmouth calls him Octavius, a corruption and faux-Latinization of Old Welsh/Breton Outham. According to the medieval Welsh genealogy from Mostyn MS. 117, Eudaf was a direct ancestor of King Arthur.
Dionotus was a legendary king of Cornwall in Geoffrey of Monmouth's Historia regum Britanniae, an account of the rulers of Britain based on ancient Welsh sources and disputed by many historians. Dionotus succeeding his brother Caradocus, and was regent of Britain during the campaigns in Gaul of Emperor Magnus Maximus. The curious thing about this king is that the Welsh chronicles, which parallel most of Geoffrey of Monmouth's book, do not mention this king by name. However, Geoffrey uses Latin versions of Welsh names so he could be referring to Dynod, duke of Cornwall, or Anwn Dynod, Maximus's own son. The latter would probably be Conan Meriadoc another son of Caradoc of Cornwall.
Gracianus Municeps was a legendary King of the Britons, according to Geoffrey of Monmouth's Historia regum Britanniae, a largely fictional account of British history. After the death of Roman Emperor Magnus Maximus, Gracianus seized the throne of Britain upon receiving word of Maximus's demise, by whose orders he had been sent to defend the attacked island while Maximus was campaigning on the continent.
Welsh mythology consists of both folk traditions developed in Wales, and traditions developed by the Celtic Britons elsewhere before the end of the first millennium. As in most of the predominantly oral societies Celtic mythology and history were recorded orally by specialists such as druids. This oral record has been lost or altered as a result of outside contact and invasion over the years. Much of this altered mythology and history is preserved in medieval Welsh manuscripts, which include the Red Book of Hergest, the White Book of Rhydderch, the Book of Aneirin and the Book of Taliesin. Other works connected to Welsh mythology include the ninth-century Latin historical compilation Historia Brittonum and Geoffrey of Monmouth's twelfth-century Latin chronicle Historia Regum Britanniae, as well as later folklore, such as the materials collected in The Welsh Fairy Book by William Jenkyn Thomas (1908).
Constantine was a 6th-century king of Dumnonia in sub-Roman Britain, who was remembered in later British tradition as a legendary King of Britain. The only contemporary information about him comes from Gildas, who castigated him for various sins, including the murder of two "royal youths" inside a church. The historical Constantine is also known from the genealogies of the Dumnonian kings, and possibly inspired the tradition of Saint Constantine, a king-turned-monk venerated in Southwest Britain and elsewhere.
Conan Meriadoc is a legendary Celtic leader credited with founding Brittany. Versions of his story circulated in both Brittany and Great Britain from at least the early 12th century, and supplanted earlier legends of Brittany's foundation. His story is known in two major versions, which appear in the Welsh text known as The Dream of Macsen Wledig, and in Geoffrey of Monmouth's Historia Regum Britanniae. Both texts associate him with Magnus Maximus, a Roman usurper against the Valentinianic dynasty who was widely regarded as having deprived Britain of its defences when he took its legions to claim the imperial throne. Conan's cousin or sister, Saint Elen, is said to have been Macsen Wledic's wife.
Cador was a legendary Duke of Cornwall, known chiefly through Geoffrey of Monmouth's pseudohistorical Historia Regum Britanniae and previous manuscript sources such as the Life of Carantoc.
Mandubracius or Mandubratius was a king of the Trinovantes of south-eastern Britain in the 1st century BC.
King Arthur's family grew throughout the centuries with King Arthur's legend. Many of the legendary members of this mythical king's family became leading characters of mythical tales in their own right.
Bledric ap Custennin was a 6th- and 7th-century ruler of Dumnonia.
Caradoc Vreichvras was a semi-legendary ancestor to the kings of Gwent. He may have lived during the 5th or 6th century. He is remembered in the Matter of Britain as a Knight of the Round Table, under the names King Carados and Carados Briefbras.
