Lazio in the context of Regions of Italy

Rome is the capital city and most populated comune (municipality) of Italy. It is also the administrative centre of the Lazio region and of the Metropolitan City of Rome. A special comune named Roma Capitale with 2,746,984 residents in 1,287.36 km (497.1 sq mi), Rome is the third most populous city in the European Union by population within city limits. The Metropolitan City of Rome Capital, with a population of 4,223,885 residents, is the most populous metropolitan city in Italy. Its metropolitan area is the third-most populous within Italy. Rome is located in the central-western portion of the Italian Peninsula, within Lazio (Latium), along the shores of the Tiber Valley. Vatican City (the smallest country in the world and headquarters of the worldwide Catholic Church under the governance of the Holy See) is an independent country inside the city boundaries of Rome, the only existing example of a country within a city. Rome is often referred to as the City of Seven Hills due to its geography, and also as the "Eternal City". Rome is generally considered to be one of the cradles of Western civilization and Western Christian culture, and the centre of the Catholic Church.

Rome's history spans 28 centuries. While Roman mythology dates the founding of Rome at around 753 BC, the site has been inhabited for much longer, making it a major human settlement for over three millennia and one of the oldest continuously occupied cities in Europe. The city's early population originated from a mix of Latins, Etruscans, and Sabines. Eventually, the city successively became the capital of the Roman Kingdom, the Roman Republic and the Roman Empire, and is regarded by many as the first-ever Imperial city and metropolis. It was first called The Eternal City (Latin: Urbs Aeterna; Italian: La Città Eterna) by the Roman poet Tibullus in the 1st century BC, and the expression was also taken up by Ovid, Virgil, and Livy. Rome is also called Caput Mundi (Capital of the World).

The Tiber (/ˈtaɪbər/ TY-bər; Italian: Tevere [ˈteːvere]; Latin: Tiberis) is the third-longest river in Italy and the longest in Central Italy, rising in the Apennine Mountains in Emilia-Romagna and flowing 406 km (252 mi) through Tuscany, Umbria, and Lazio, where it is joined by the River Aniene, to the Tyrrhenian Sea, between Ostia and Fiumicino. It drains a basin estimated at 17,375 km (6,709 sq mi). The river has achieved lasting fame as the main watercourse of the city of Rome, which was founded on its eastern banks.

The river rises at Mount Fumaiolo in Central Italy and flows in a generally southerly direction past Perugia and Rome to meet the sea at Ostia. The Tiber has advanced significantly at its mouth, by about 3 km (2 mi), since Roman times, leaving the ancient port of Ostia Antica 6 kilometres (4 miles) inland. However, it does not form a proportional delta, owing to a strong north-flowing sea current close to the shore, due to the steep shelving of the coast, and to slow tectonic subsidence.

The Etruscans (/ɪˈtrʌskən/ ih-TRUS-kən) created a civilization in Etruria in ancient Italy, with a common language and culture, and formed a federation of city-states. After adjacent lands had been conquered, its territory covered, at its greatest extent, roughly what is now Tuscany, western Umbria and northern Lazio, as well as what are now the Po Valley, Emilia-Romagna, south-eastern Lombardy, southern Veneto and western Campania.

A large body of literature has flourished on the origins of the Etruscans, but the consensus among modern scholars is that the Etruscans were an indigenous population. The earliest evidence of a culture that is identifiably Etruscan dates from about 900 BC. This is the period of the Iron Age Villanovan culture, considered to be the earliest phase of Etruscan civilization, which itself developed from the previous late Bronze Age Proto-Villanovan culture in the same region, part of the central European Urnfield culture system. Etruscan civilization dominated Italy until it fell to the expanding Rome beginning in the late 4th century BC as a result of the Roman–Etruscan Wars; Etruscans were granted Roman citizenship in 90 BC and in 27 BC the whole Etruscan territory was incorporated into the newly established Roman Empire.

Latin (lingua Latina or Latinum) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally spoken by the Latins in Latium (now known as Lazio), the lower Tiber area around Rome, Italy. Through the expansion of the Roman Republic, it became the dominant language in the Italian Peninsula and subsequently throughout the Roman Empire. It has greatly influenced many languages, including English, having contributed many words to the English lexicon, particularly after the Christianisation of the Anglo-Saxons and the Norman Conquest. Latin roots appear frequently in the technical vocabulary used by fields such as theology, the sciences, medicine, and law.

By the late Roman Republic, Old Latin had evolved into standardised Classical Latin. Vulgar Latin refers to the less prestigious colloquial registers, attested in inscriptions and some literary works such as those of the comic playwrights Plautus and Terence and the author Petronius. While often called a "dead language", Latin did not undergo language death. Between the 6th and 9th centuries, natural language change in the vernacular Latin of different regions evolved into distinct Romance languages. After the fall of the Western Roman Empire, Latin remained the common language of international communication, science, scholarship and academia in Europe into the early 19th century, by which time modern languages had supplanted it in common academic and political usage.

Vulci or Volci (Etruscan: Velch or Velx, depending on the romanization used) was a rich Etruscan city in what is now northern Lazio, central Italy.

As George Dennis wrote, "Vulci is a city whose very name ... was scarcely remembered, but which now, for the enormous treasures of antiquity it has yielded, is exalted above every other city of the ancient world."

Metropolitan City of Rome Capital (Italian: città metropolitana di Roma Capitale) is an area of local government at the level of metropolitan city in the Lazio region of Italy. It comprises the territory of the city of Rome and 120 other comuni (sg.: comune) in the hinterland of the city. With more than 4.2 million inhabitants, it is the largest metropolitan city in Italy as of 2025.

It was established on 1 January 2015 by the terms of Law 142/1990 (Reform of local authorities) and by Law 56/2014. It superseded the province of Rome. The Metropolitan City of Rome Capital is headed by the Metropolitan Mayor (Sindaco metropolitano) and governed by the Metropolitan Council (Consiglio metropolitano). Roberto Gualtieri is the incumbent mayor, having taken office on 21 October 2021.

The Rome metropolitan area is a statistical area that is centred on the city of Rome, Italy. It consists of a part of the Metropolitan City of Rome Capital (formerly known as the Province of Rome) and a single comune, Aprilia, in the neighbouring Province of Latina. Both provinces are part of the region of Lazio. The metropolitan area does not have any administrative designation or function unlike the Metropolitan City of Rome Capital.

The Tiber Valley (Italian: Valle del Tevere) is the largest geographical part of the Tiber basin [Wikidata] of the Tiber river included in the Emilia-Romagna, Tuscany, Umbria, and the Lazio regions; it is characterized by river terraces and floodplain areas that extend from the Apennine belt up to the delta of the Tiber river in the Lazio coast [it] of the Tyrrhenian Sea.

The Aniene (pronounced [aˈnjɛːne]; Latin: Aniō), formerly known as the Teverone, is a 99-kilometer (62 mi) river in Lazio, Italy. It originates in the Apennines at Trevi nel Lazio and flows westward past Subiaco, Vicovaro, and Tivoli to join the Tiber in northern Rome. It formed the principal valley east of ancient Rome and became an important water source as the city's population expanded. The falls at Tivoli were noted for their beauty. Historic bridges across the river include the Ponte Nomentano, Ponte Mammolo, Ponte Salario, and Ponte di San Francesco, all of which were originally fortified with towers.

Fiumicino (Italian: [fjumiˈtʃiːno]) is a town and comune in the Metropolitan City of Rome, Lazio, central Italy, with a population of 80,500 (2019). It is known for being the site of Leonardo da Vinci–Fiumicino Airport, the busiest airport in Italy and the eighth-busiest in Europe, which serves Rome and much of central Italy.

Etruria (/ɪˈtrʊəriə/ ih-TROOR-ee-ə) was a region of Central Italy delimited by the rivers Arno and Tiber, an area that covered what is now most of Tuscany, northern Lazio, and north-western Umbria. It was inhabited by the Etruscans, an ancient civilization that flourished in the area from around the 8th century BC until they were assimilated into the Roman Republic in the 4th century BC.

The Falisci were an Italic tribe who lived in what is now northern Lazio, on the Etruscan side of the Tiber River. They spoke an Italic language, Faliscan, closely related to Latin. Originally a sovereign state, politically and socially they supported the Etruscans, joining the Etruscan League. This conviction and affiliation led to their ultimate near destruction and total subjugation by Rome.

Only one instance of their own endonym has been found to date: an inscription from Falerii Novi from the late 2nd century AD refers to the falesce quei in Sardinia sunt, "the Faliscans who are in Sardinia", where falesce is the nominative plural case. An Etruscan inscription calls them the feluskeś. The Latin cannot be far different from the original name. The -sc- suffix is "distinctive of the Italic ethnonyms".

Latium Vetus or Latium Antiquum (English: Old Latium) is a region of the Italian Peninsula bounded to the north by the Tiber River, to the east by the central Apennine Mountains, to the west by the Mediterranean Sea and to the south by Monte Circeo. It was the territory of the Latins, an Italic tribe which included the early inhabitants of the city of Rome. Later it was also settled by various Italic tribes such as the Rutulians, Volscians, Aequi, and Hernici. The region was referred to as "old" to distinguish it from the expanded region, Latium, that included the region to the south of Old Latium, between Monte Circeo and the river Garigliano – the so-called Latium adiectum ("attached Latium"). It corresponded to the central part of the modern administrative region of Lazio, Italy, and it covered an area measuring of roughly 50 Roman miles. It was calculated by Mommsen that the region's area was about 1860 square kilometres.