Traditionally considered a Volscian city, with the name of Frusna and then the Roman of Latium adiectum as Frùsino, over the course of its millenary history it has been subjected to multiple devastations and plunders caused by its geostrategic position; as a consequence of this, as well as of destruction due to seismic events (the most ruinous of which occurred in September 1349), it retains only rare, albeit significant, traces of its past.

These have been accompanied by a more recent hypothesis, which, based on the links between the pre-Roman Italic civilizations, and in particular the Etruscan one, with the Akkadian-Sumerian peoples, posits similar influences also for toponyms: according to this, Frusna would have the meaning of "Land sprinkled by rivers".

The city was founded in the territory of Hernicians by the Volsci in the 6th century BC with the name of Fruscìno or Frusna, as a strategic outpost in front of the impregnable fortress of Aletrium (today known as Alatri).

[citation needed] Many ancient writers, including Tito Livio, Cassio Dione, Silio Italico, Festo Pomponio, Floro, the aforementioned Juvenal, and Marco Tullio Cicerone (Cicero) note the city of Frusino not only for mere historical facts, but also for the virtues of its inhabitants.

[citation needed] After the fall of the Western Roman Empire, Frosinone was destroyed several times by foreign invaders; in the early Middle Ages it was an agricultural centre of the Duchy of Rome.

At the beginning of the 14th century, the city was dominated by the nearby and powerful Alatri, in turn, conquered by Francesco de Ceccano and his Ceccanesi troops for thirty years.

New destruction occurred with the occupation by the Spanish troops at war against Pope Paul IV in 1556: its fortress was strategically important for the control of the whole Sacco valley and for the defence of Rome.

On the occasion of the journey of Pius IX in the province of Campagna and Marittima (13–20 May 1863) by train, solemn celebrations were organized, which ended with the blessing of the pope from the balcony of the Prefecture.

In reality, the secular papal dominion over the city had in fact already ended on the evening of 12 September with the escape of the last apostolic delegate, Monsignor Pietro Lasagni, while the Italian troops were still along the Casilina, in the territory of Ripi, in waiting to resume the march towards Frosinone.

In 1874 a row of buildings of over 300 meters was built, known as the "Berardi palace", intended to meet the housing needs of the newborn State for employees and soldiers.

A smaller part of the inhabitants resided in the historic centre employed in the various offices of the sub-prefecture, the Municipality and other administrations including the Military District.

The bombings razed 80% of the city to the ground, including the Church of the Annunziata, the Berardi Palace, the Town Hall, the entire medieval village which was developed in the area of Via Cavour, the barracks of the R.R.

The bell tower, a symbol of the city and on which a siren had been placed to warn citizens in case of enemy air raids, reported a large circular hole on one of the clocks.

This was then reused for the new monument to the fallen, of all wars, in Frosinone, built by Umberto Mastroianni at the end of the seventies and which is now located in one of the "corners" of Viale Mazzini.

[12] A census of the following year recorded 3,050 rooms completely destroyed, 4,880 badly damaged, 8,500 people were left homeless, practically all the inhabitants of the upper part of Frosinone.

Specifically, between 1950 and 1960, Frosinone saw a continuation of the trends it had seen in the immediate postwar period: a steady decline in the agricultural sector (to 9% of employed residents), a modest increase in industry (to 36%) and a significant rise in tertiary activities, in which 54% of the workforce is engaged.

The reconstruction work continues, including: renovations to important buildings (such as the sites of the Prefecture, the Bank of Italy, the halls of Justice, the Chamber of Commerce and the Post and Telecommunications); new construction (such as the Civil Hospital, public housing and the Edera skyscraper); the expansion of the urban and extra-urban road network; and providing public water connections to nearby rural settlements.

It features a bell tower (Il Campanile), 68 meters high, which is considered the most emblematic monument of the city, with three rows of mullioned windows.

Built in 1134, the abbey church of San Benedetto which is also the oldest art gallery in the city, was rebuilt between 1750 and 1797 in late Baroque style, with an octagonal lantern and a facade with two superimposed orders.

When the prodigy of sweating occurred in 1675, the very young Cardinal Francesco Orsini, future Pope Benedict XIII, at the time archbishop of Benevento, also intervened among the illustrious pilgrims who came to venerate the image assisted.

In 1727, now elected Pope, he wanted to return to Frosinone on the eve of the Ascension to venerate the Madonna della Neve, still today there is a plaque commemorating her visit.

The Church of San Magno, or of the Madonna della Delibera, dates back to the 9th century, but its current appearance is partly due to the restoration in 1747.

A church with this name was built in the 16th century at the behest of Bishop Ennio Filonardi, for the burial of those sentenced to death, in the place where the Bank of Italy building would later rise.

The church, with a single nave, has various side chapels and a precious 14th century fresco, placed behind the central altar, depicting the Madonna nursing the Child, a typical image of popular devotion as well as the only fragment of the ancient building of San Lorenzo.

San Clemente Maria Hofbauer lived for some time in the annexed religious house founded by Sant'Alfonso and celebrated his first Holy Mass in this church.

The building, seat of the provincial administration of Frosinone, was built between 1930 and 1933 in the neoclassical style – but with a reinforced concrete structure – based on a project by the architect Giovanni Jacobucci.

[17] In the atrium of the building there is the bronze statue of the Dancer: this early twentieth century work by Amleto Cataldi – a sculptor originally from Roccasecca and Castrocielo whose production mainly developed in Rome – has been brought back to Italy from the United States, where it had been since the 1920s, In 2010.

The palace also houses works of art by Umberto Mastroianni, Renato Guttuso, Cavalier d'Arpino, Aldo Turkeyro and Giovanni Colacicchi.

This imposing building was built as the seat of elementary schools, based on a project by engineer Edgardo Vivoli, "on the verdant spur of the Belvedere hill in view of the delightful plain" and was dedicated to the gold medal Pietro Tiravanti, who fell in Libya during the First World War.

The building, with an elliptical plan, had the main entrances to the arena at the ends of its major axis of about 80 m, which is presumed to have had a single order of steps, eventually holding about 2000 spectators.