Gracianus Municeps was a legendary

King of the Britons The title King of the Britons ( cy, Brenin y Brythoniaid, la, Rex Britannorum) was used (often retrospectively) to refer to the most powerful ruler among the Celtic Britons, both before and after the period of Roman Britain up until the Norma ...

, according to

Geoffrey of Monmouth Geoffrey of Monmouth ( la, Galfridus Monemutensis, Galfridus Arturus, cy, Gruffudd ap Arthur, Sieffre o Fynwy; 1095 – 1155) was a British cleric from Monmouth, Wales and one of the major figures in the development of British historiograph ...

's ''

Historia regum Britanniae ''Historia regum Britanniae'' (''The History of the Kings of Britain''), originally called ''De gestis Britonum'' (''On the Deeds of the Britons''), is a pseudohistorical account of British history, written around 1136 by Geoffrey of Monmouth. I ...

'' (Latin: ''History of the Kings of Britain''), a largely fictional account of British history. After the death of Roman Emperor

Magnus Maximus Magnus Maximus (; cy, Macsen Wledig ; died 8 August 388) was Roman emperor of the Western Roman Empire from 383 to 388. He usurped the throne from emperor Gratian in 383 through negotiation with emperor Theodosius I. He was made emperor in B ...

, 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. Gracianus served under Maximus during his campaigns in

Rome , established_title = Founded , established_date = 753 BC , founder = King Romulus (legendary) , image_map = Map of comune of Rome (metropolitan city of Capital Rome, region Lazio, Italy).svg , map_caption ...

and

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

, and was sent to

Britain Britain most often refers to: * The United Kingdom, a sovereign state in Europe comprising the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands * Great Britain, the largest island in the United King ...

to defeat Wanius and Melga, the kings of the

Picts The Picts were a group of peoples who lived in what is now northern and eastern Scotland (north of the Firth of Forth) during Late Antiquity and the Early Middle Ages. Where they lived and what their culture was like can be inferred from ea ...

and

Huns The Huns were a nomadic people who lived in Central Asia, the Caucasus, and Eastern Europe between the 4th and 6th century AD. According to European tradition, they were first reported living east of the Volga River, in an area that was part ...

respectively. He defeated the armies of both kings immediately upon arrival, ejecting them to

Ireland Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea ...

. Soon after, word came that Maximus had died at the hands of either a supporter of the late Roman Emperor

Gratian Gratian (; la, Gratianus; 18 April 359 – 25 August 383) was emperor of the Western Roman Empire from 367 to 383. The eldest son of Valentinian I, Gratian accompanied his father on several campaigns along the Rhine and Danube frontiers and wa ...

or by one of Gracianus Municeps' own followers. Despite mention previously made by Geoffrey of Monmouth of

Dionotus 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 wa ...

, regent in Maximus' absence and king of

Cornwall Cornwall (; kw, Kernow ) is a historic county and ceremonial county in South West England. It is recognised as one of the Celtic nations, and is the homeland of the Cornish people. Cornwall is bordered to the north and west by the Atlantic ...

, Gracianus seized the crown of Britain and began a reign of terror throughout the island but soon certain

plebs In ancient Rome, the plebeians (also called plebs) were the general body of free Roman citizenship, Roman citizens who were not Patrician (ancient Rome), patricians, as determined by the capite censi, census, or in other words "commoners". Both ...

banded together and assassinated him. This led to a period of instability when news of his demise reached Britain's enemies, but he was eventually succeeded by Constantine II of Britain, the brother of King of

Brittany Brittany (; french: link=no, Bretagne ; br, Breizh, or ; Gallo language, Gallo: ''Bertaèyn'' ) is a peninsula, Historical region, historical country and cultural area in the west of modern France, covering the western part of what was known ...

. Historically, the predecessor to Constantine was

on whom Geoffrey's tale was probably based.

Bede Bede ( ; ang, Bǣda , ; 672/326 May 735), also known as Saint Bede, The Venerable Bede, and Bede the Venerable ( la, Beda Venerabilis), was an English monk at the monastery of St Peter and its companion monastery of St Paul in the Kingdom o ...

refers to this Gratian as Municeps in Chapter XI of his ''

Ecclesiastic History of the English People The ''Ecclesiastical History of the English People'' ( la, Historia ecclesiastica gentis Anglorum), written by Bede in about AD 731, is a history of the Christian Churches in England, and of England generally; its main focus is on the conflict be ...

'' (''Historia ecclesiastica gentis Anglorum'') and the epithet is seemingly there to distinguish this Gratian from the earlier

killed by the Usurper Magnus Maximus.

See also