Italy (geographical region) in the context of "List of historic states of Italy"

The Italian Peninsula (Italian: penisola italica or penisola italiana) is located within the Italian geographical region; it extends from the southern Alps in the north to the central Mediterranean Sea in the south which comprises much of the country of Italy and the enclaved microstates of San Marino and Vatican City.The peninsula is also known as the Italic Peninsula, Apennine Peninsula, Italian Boot, or Mainland Italy.

This list of ancient peoples living in Italy summarises the many different Italian populations that existed in antiquity. Among them, the Romans succeeded in Romanizing the entire Italian peninsula following the Roman expansion in Italy, which provides the time-window in which most of the names of the remaining ancient Italian peoples first appear in existing written documentation. Many names are exonyms assigned by the ancient writers of works in ancient Greek and Latin, while others are scholarly inventions.

Nearly all of these peoples and tribes spoke Indo-European languages: Italics, Celts, Ancient Greeks, and tribes likely occupying various intermediate positions between these language groups. On the other hand, some Italian peoples (such as the Rhaetians, Camuni, Etruscans) likely spoke non- or pre-Indo-European languages. In addition, peoples speaking languages of the Afro-Asiatic family, specifically the largely Semitic Phoenicians and Carthaginians, settled and colonized parts of western and southern Sardinia and western Sicily.

The Roman expansion in Italy covers a series of conflicts in which Rome grew from being a small Italian city-state to be the ruler of the Italian region. Roman tradition attributes to the Roman kings the first war against the Sabines and the first conquests around the Alban Hills and down to the coast of Latium. The birth of the Roman Republic after the overthrow of the Etruscan monarch of Rome in 509 BC began a series of major wars between the Romans and the Etruscans. In 390 BC, Gauls from the north of Italy sacked Rome. In the second half of the 4th century BC Rome clashed repeatedly with the Samnites, a powerful tribal coalition of the Apennine region.

By the end of these wars, Rome had become the most powerful state in central Italy and began to expand to the north and to the south. The last threat to Roman hegemony came during the Pyrrhic War (280–275 BC) when Tarentum enlisted the aid of the Greek king Pyrrhus of Epirus to campaign in the North of Italy. Resistance in Etruria was finally crushed in 265–264 BC, the same year the First Punic War began and brought Roman forces outside of the peninsula for the first time. Starting from the First Punic War (264–241 BC) the territories subject to Roman rule also included Sicily (241 BC), Sardinia and Corsica (238 BC), islands transformed into provinces.

Italy, up until its unification in 1861, was a conglomeration of city-states, republics, and other independent entities. The following is a list of the various Italian states during that period. Following the fall of the Western Roman Empire and the arrival of the Middle Ages (in particular from the 11th century), the Italian Peninsula was divided into numerous states. Many of these states consolidated into major political units that balanced the power on the Italian Peninsula: the Papal States, the Venetian Republic, the Republic of Florence, the Duchy of Milan, the Kingdom of Naples and the Kingdom of Sicily. Unlike all the other Italian states of the medieval and early modern period, the republics of Venice and Genoa, thanks to their maritime power, went beyond territorial conquests within the Italian Peninsula, conquering various regions across the Mediterranean and Black Seas.