Salerno (UK: , US: ; Italian: [saˈlɛrno] ; Neapolitan: Salierno [saˈljernə]) is a city and comune in Campania, southern Italy, and the capital of the province of the same name. With 125,958 inhabitants as of 2025, it is the second most populous municipality in the region after Naples. The city lies on the Gulf of Salerno, on the Tyrrhenian Sea. Salerno city’s origins are probably Magna Greece, though the dated archaeological evidence cited is a 6th-century BC Etruscan-Campanian necropolis; the clearer Magna Graecia link is nearby Poseidonia/Paestum. Salerno was home to the Schola Medica Salernitana, one of the earliest medical institutions in Europe, active by the 11th century and widely regarded as a forerunner of the modern university. From February to August 1944, it served as the seat of the Italian government, hosting the Badoglio and Bonomi cabinets at the Salone dei Marmi. It was during this period that the Italian Communist Party agreed to join a national unity government, a decision known as the "Salerno turn" that opened the way to the Allied reconquest of the peninsula. For these months the city was effectively Italy's capital city, and it was here that Victor Emmanuel III settled after leaving Rome in the wake of the Armistice of Cassibile.
During the Early Middle Ages, under Lombard rule, Salerno flourished as the capital of the Principality of Salerno, which gradually came to encompass much of Southern Italy. It regained capital status under the Normans, serving as the seat of the Duchy of Apulia and Calabria. Later, under the Angevins, the title of Prince of Salerno was conferred on the heirs apparent to the throne of the Kingdom of Naples. From the 13th to the 19th century the city was also the capital of the province of Principato Citeriore.
Since 1968, the city has hosted the University of Salerno, which in 1988 was relocated as a campus to the neighbouring municipalities of Fisciano and Baronissi.
In September 1943, Salerno was one of the landing sites of Operation Avalanche, the Allied invasion of mainland Italy.
The modern city is divided into three distinct zones: the medieval centro storico, a 19th-century quarter, and the more extensive post-war residential districts, dominated by apartment blocks. One of its patron saints is Matthew the Apostle, whose relics are preserved in the crypt of Salerno Cathedral.
The area of what is now Salerno has been continuously settled since pre-historical times, as the discoveries of Neolithic mummy remains documents. Inhabited by Oscan-speaking populations, the region was colonized by the Etruscans, who founded the city of Irnthi in the 6th century BC, across the Irno river, in what is today the urban district of Fratte, as a part of their Dodecapolis political model that they had essentially replicated in Campania. This settlement represented an important base for Etruscan trade with the nearby Greek colonies of Posidonia and Elea. It was occupied by the Samnites around the 5th century BC as a consequence of the Battle of Cumae (474 BC) as part of the Syracusan sphere of influence.
With the Roman advance in Campania, Irna began to lose its importance, being supplanted by the new Roman colony (197 BC) of Salernum, developing around an initial castrum. The new city, which gradually lost its military function in favour of its role as a trade centre, was connected to Rome by the Via Popilia, which ran towards Lucania and Reggio Calabria.
Archaeological remains, although fragmentary, suggest the idea of a flourishing and lively city. Under the Emperor Diocletian, in the late 3rd century AD, Salernum became the administrative centre of the Lucania and Bruttii province.
In the following century, during the Gothic Wars, the Goths were defeated by the Byzantines, and the Salerno briefly returned to the control of Constantinople (from 553 to 568), before the Lombards invaded almost the whole peninsula. Like many coastal cities of southern Italy (Gaeta, Sorrento, Amalfi), Salerno initially remained untouched by the newcomers, falling only in 646. It subsequently became part of the Duchy of Benevento.
Middle Ages to early modern age
Under the Lombard dukes, Salerno enjoyed a splendid period of growth.
In 774, Arechis II of Benevento transferred the seat of the Duchy of Benevento to Salerno, in order to elude Charlemagne's offensive and to secure for himself the control of a strategic area, the centre of coastal and internal communications in Campania.
Under Arechis II, Salerno became a centre of studies with its famous Medical School. The Lombard prince ordered the city to be fortified; the Castle on the Bonadies mountain had already been built with walls and towers. In 839, Salerno declared independence from Benevento, becoming the capital of a flourishing principality stretching out to Capua, northern Calabria and Apulia up to Taranto. In 871–872, the Aghlabids besieged Salerno, but the city was relieved by Louis II of Italy.
Around the year 1000, prince Guaimar IV annexed Amalfi, Sorrento, Gaeta and the whole duchy of Apulia and Calabria, starting to conceive a future unification of the whole southern Italy under Salerno's arms. The coins minted in the city circulated all over the Mediterranean, with the Opulenta Salernum wording to certify its richness.
However, the stability of the Principate was continually shaken by the Saracen attacks and, most of all, by internal struggles. In 1056, one of the numerous plots led to the fall of Guaimar. His weaker son Gisulf II succeeded him, but the decline of the principality had begun. In 1077, Salerno reached its zenith but soon lost all its territory to the Normans.
On 13 December 1076, the Norman conqueror Robert Guiscard, who had married Guaimar IV's daughter Sikelgaita, besieged Salerno and defeated his brother-in-law Gisulf. In this period, the royal palace of Castel Terracena and the cathedral were built, and science was promoted as the Schola Medica Salernitana, open to women like Trota of Salerno and Mercuriade also, considered the most ancient medical institution of the European West, reached its maximum splendour with texts like Trotula. By the late 11th century, the city was home to 50,000 people.
In 1100, Salerno was made the capital of Norman southern Italy, after Melfi.
Salerno was an important city of the Normans for half a century, but with the Norman conquest of southern Italy, the city of Palermo started to overtake Salerno in status. Salerno played a little part in the fall of the County of Sicily, after the Emperor Henry VI's invasion on behalf of his wife, Constance, the heiress to the kingdom, in 1191, Salerno surrendered and promised loyalty on the news of an incoming army.