Moridunum was a

Roman fort In the Roman Republic and the Roman Empire, the Latin word ''castrum'', plural ''castra'', was a military-related term. In Latin usage, the singular form ''castrum'' meant 'fort', while the plural form ''castra'' meant 'camp'. The singular and ...

and

town A town is a human settlement. Towns are generally larger than villages and smaller than cities, though the criteria to distinguish between them vary considerably in different parts of the world. Origin and use The word "town" shares an ori ...

in the

Roman province The Roman provinces (Latin: ''provincia'', pl. ''provinciae'') were the administrative regions of Ancient Rome outside Roman Italy that were controlled by the Romans under the Roman Republic and later the Roman Empire. Each province was rule ...

Britannia Britannia () is the national personification of Britain as a helmeted female warrior holding a trident and shield. An image first used in classical antiquity, the Latin ''Britannia'' was the name variously applied to the British Isles, Great ...

. Today it is known as

Carmarthen Carmarthen (, RP: ; cy, Caerfyrddin , "Merlin's fort" or "Sea-town fort") is the county town of Carmarthenshire and a community in Wales, lying on the River Towy. north of its estuary in Carmarthen Bay. The population was 14,185 in 2011, ...

, located in the

Welsh Welsh may refer to: Related to Wales * Welsh, referring or related to Wales * Welsh language, a Brittonic Celtic language spoken in Wales * Welsh people People * Welsh (surname) * Sometimes used as a synonym for the ancient Britons (Celtic peop ...

county of

Carmarthenshire Carmarthenshire ( cy, Sir Gaerfyrddin; or informally ') is a county in the south-west of Wales. The three largest towns are Llanelli, Carmarthen and Ammanford. Carmarthen is the county town and administrative centre. The county is known as ...

(formerly in the county of

Dyfed Dyfed () is a preserved county in southwestern Wales. It is a mostly rural area with a coastline on the Irish Sea and the Bristol Channel. Between 1974 and 1996, Dyfed was also the name of the area's county council and the name remains in use f ...

Fort

Moridunum ( "sea fort") was the

civitas In Ancient Rome, the Latin term (; plural ), according to Cicero in the time of the late Roman Republic, was the social body of the , or citizens, united by law (). It is the law that binds them together, giving them responsibilities () on th ...

capital of the

Demetae The Demetae were a Celtic people of Iron Age and Roman period, who inhabited modern Pembrokeshire and Carmarthenshire in south-west Wales, and gave their name to the county of Dyfed. Classical references They are mentioned in Ptolemy's ''Geograp ...

tribe The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide usage of the term in English language, English is in the discipline of anthropology. This definition is contested, in p ...

Roman Wales The Roman era in the area of modern Wales began in 48 AD, with a military invasion by the imperial governor of Roman Britain. The conquest was completed by 78 AD, and Roman rule endured until the region was abandoned in 383 AD. The Roman Emp ...

and was recorded by

Ptolemy Claudius Ptolemy (; grc-gre, Πτολεμαῖος, ; la, Claudius Ptolemaeus; AD) was a mathematician, astronomer, astrologer, geographer, and music theorist, who wrote about a dozen scientific treatises, three of which were of importanc ...

and in the

Antonine Itinerary The Antonine Itinerary ( la, Itinerarium Antonini Augusti, "The Itinerary of the Emperor Antoninus") is a famous ''itinerarium'', a register of the stations and distances along various roads. Seemingly based on official documents, possibly ...

. The initial

fort A fortification is a military construction or building designed for the defense of territories in warfare, and is also used to establish rule in a region during peacetime. The term is derived from Latin ''fortis'' ("strong") and ''facere'' ...

is believed to date from about AD 75, possibly replacing the

hillfort A hillfort is a type of earthwork used as a fortified refuge or defended settlement, located to exploit a rise in elevation for defensive advantage. They are typically European and of the Bronze Age or Iron Age. Some were used in the post-Roma ...

on Merlin's Hill. The fort lasted until about 120, when the associated civilian ''

vicus In Ancient Rome, the Latin term (plural ) designated a village within a rural area () or the neighbourhood of a larger settlement. During the Republican era, the four of the city of Rome were subdivided into . In the 1st century BC, Augustus r ...

'' took over and the place became a town.

Town

A street-grid was laid out in the town and a public

bath house Public baths originated when most people in population centers did not have access to private bathing facilities. Though termed "public", they have often been restricted according to gender, religious affiliation, personal membership, and other cr ...

built, and possibly a ''

mansio In the Roman Empire, a ''mansio'' (from the Latin word ''mansus,'' the perfect passive participle of ''manere'' "to remain" or "to stay") was an official stopping place on a Roman road, or ''via'', maintained by the central government for the use ...

''. The

forum Forum or The Forum (plural forums or fora) may refer to: Common uses * Forum (legal), designated space for public expression in the United States *Forum (Roman), open public space within a Roman city **Roman Forum, most famous example *Internet ...

and

basilica In Ancient Roman architecture, a basilica is a large public building with multiple functions, typically built alongside the town's forum. The basilica was in the Latin West equivalent to a stoa in the Greek East. The building gave its name ...

were probably under the most built-up area of the present town on the

cardo A cardo (plural ''cardines'') was a north–south street in Ancient Roman cities and military camps as an integral component of city planning. The cardo maximus, or most often the ''cardo'', was the main or central north–south-oriented street ...

or main street. There were narrow shops fronting the streets, as well as evidence of metalworking. Large domestic homes of timber were rebuilt in stone in the late 3rd or early 4th century. A 1st/2nd century Romano-Celtic style

temple A temple (from the Latin ) is a building reserved for spiritual rituals and activities such as prayer and sacrifice. Religions which erect temples include Christianity (whose temples are typically called churches), Hinduism (whose temples ...

has also been excavated. A turf bank and ditch was erected around the town in the mid-2nd century and a stone wall added some time later.

Amphitheatre

East of the old town is one of only seven surviving Roman

amphitheatre An amphitheatre (British English) or amphitheater (American English; both ) is an open-air venue used for entertainment, performances, and sports. The term derives from the ancient Greek ('), from ('), meaning "on both sides" or "around" and ...

s in the United Kingdom (). It has the only above-ground Roman remains in the town, and was excavated in 1968. The arena itself is 46 by 27 meters. The circumference of the ''

cavea The ''cavea'' (Latin for "enclosure") are the seating sections of Greek and Roman theatres and amphitheatres An amphitheatre (British English) or amphitheater (American English; both ) is an open-air venue used for entertainment, performance ...

'' seating area is 92 by 67 meters It had stone walls and wooden seating and was much larger than would be expected for the size of the town.

Post-Roman times

The addition of '

Caer Caer (; owl, cair or ') is a placename element in Welsh meaning "stronghold", "fortress", or "citadel", roughly equivalent to an Old English suffix (''-ceaster'') now variously written as , , and .Allen, Grant.