Trinovantum is the name in medieval British legend that was given to

London London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...

, according to

Geoffrey of Monmouth Geoffrey of Monmouth (; ; ) was a Catholic cleric from Monmouth, Wales, and one of the major figures in the development of British historiography and the popularity of tales of King Arthur. He is best known for his chronicle '' The History of ...

's ''

Historia Regum Britanniae (''The History of the Kings of Britain''), originally called (''On the Deeds of the Britons''), is a fictitious account of British history, written around 1136 by Geoffrey of Monmouth. It chronicles the lives of the List of legendary kings o ...

'', when it was founded by the exiled

Trojan Trojan or Trojans may refer to: * Of or from the ancient city of Troy * Trojan language, the language of the historical Trojans Arts and entertainment Music * '' Les Troyens'' ('The Trojans'), an opera by Berlioz, premiered part 1863, part 18 ...

Brutus Marcus Junius Brutus (; ; 85 BC – 23 October 42 BC) was a Roman politician, orator, and the most famous of the assassins of Julius Caesar. After being adopted by a relative, he used the name Quintus Servilius Caepio Brutus, which was reta ...

, who called it ''Troia Nova'' ("New Troy"), which was gradually corrupted to ''Trinovantum''. The legend says that it was later rebuilt by King Lud, who named it ''Caer Lud'' ("Lud's Fort") after himself and that the name became corrupted to ''Kaer Llundain'' and finally London. The legend is part of the

Matter of Britain The Matter of Britain (; ; ; ) is the body of medieval literature and legendary material associated with Great Britain and Brittany and the list of legendary kings of Britain, legendary kings and heroes associated with it, particularly King Art ...

. The name ''Trinovantum'' derives from the

Iron Age The Iron Age () is the final epoch of the three historical Metal Ages, after the Chalcolithic and Bronze Age. It has also been considered as the final age of the three-age division starting with prehistory (before recorded history) and progre ...

tribe of the

Trinovantes The Trinovantēs (Common Brittonic: *''Trinowantī'') or Trinobantes were one of the Celtic tribes of Pre-Roman Britain. Their territory was on the north side of the Thames estuary in current Essex, Hertfordshire and Suffolk, and included land ...

, who lived in

Essex Essex ( ) is a Ceremonial counties of England, ceremonial county in the East of England, and one of the home counties. It is bordered by Cambridgeshire and Suffolk to the north, the North Sea to the east, Kent across the Thames Estuary to the ...

Suffolk Suffolk ( ) is a ceremonial county in the East of England and East Anglia. It is bordered by Norfolk to the north, the North Sea to the east, Essex to the south, and Cambridgeshire to the west. Ipswich is the largest settlement and the county ...

and part of

Greater London Greater London is an administrative area in England, coterminous with the London region, containing most of the continuous urban area of London. It contains 33 local government districts: the 32 London boroughs, which form a Ceremonial count ...

and are mentioned by

Julius Caesar Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC) was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in Caesar's civil wa ...

in his account of his expeditions to Britain in 55 and 54 BC. In a later account of those expeditions by

Orosius Paulus Orosius (; born 375/385 – 420 AD), less often Paul Orosius in English, was a Roman priest, historian and theologian, and a student of Augustine of Hippo. It is possible that he was born in '' Bracara Augusta'' (now Braga, Portugal), ...

, they are referred to as ''civitas Trinovantum'', "the nation of the Trinovantes", with ''Trinovantum'' in this case being in the

genitive In grammar, the genitive case ( abbreviated ) is the grammatical case that marks a word, usually a noun, as modifying another word, also usually a noun—thus indicating an attributive relationship of one noun to the other noun. A genitive can ...

plural In many languages, a plural (sometimes list of glossing abbreviations, abbreviated as pl., pl, , or ), is one of the values of the grammatical number, grammatical category of number. The plural of a noun typically denotes a quantity greater than ...

. However, as ''civitas'' can also mean "city" and

Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...

neuter

noun In grammar, a noun is a word that represents a concrete or abstract thing, like living creatures, places, actions, qualities, states of existence, and ideas. A noun may serve as an Object (grammar), object or Subject (grammar), subject within a p ...

s often end in ''-um'' in the

nominative In grammar, the nominative case ( abbreviated ), subjective case, straight case, or upright case is one of the grammatical cases of a noun or other part of speech, which generally marks the subject of a verb, or (in Latin and formal variants of E ...

singular Singular may refer to: * Singular, the grammatical number that denotes a unit quantity, as opposed to the plural and other forms * Singular or sounder, a group of boar, see List of animal names * Singular (band), a Thai jazz pop duo *'' Singula ...

, this phrase was misinterpreted by Geoffrey or his sources as "the city Trinovantum". In

Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of Roman civilization *Epistle to the Romans, shortened to Romans, a letter w ...

times, the city was known by the name

Londinium Londinium, also known as Roman London, was the capital of Roman Britain during most of the period of Roman rule. Most twenty-first century historians think that it was originally a settlement established shortly after the Roman conquest of Brit ...

, which appears to be cognate with ''Llundain'' and ''London''.

References

, ''

'' 1.17 *

, ''

Commentarii de Bello Gallico ''Commentarii de Bello Gallico'' (; ), also ''Bellum Gallicum'' (), is Julius Caesar's first-hand account of the Gallic Wars, written as a third-person narrative. In it, Caesar describes the battles and intrigues that took place in the nine yea ...

'' 5.20 *

, ''Seven Books of History Against the Pagans'
6.9
(Latin only) * {{Geoffrey of Monmouth History of London Geoffrey of Monmouth Traditional history of Julius Caesar's invasions of Britain