Valle Latina (English: "Latin Valley") is an Italian geographical and historical region that extends from the south of Rome to Cassino,[1][2][3] corresponding to the eastern area of ancient Roman Latium.

The Latins and Romans mixed with the pre-existing Osco-Umbrian-speaking populations, in particular the Hernici, with their capital Anagni,[4] and the Volsci in Frosinone and in the Liri Valley.

Around the year 529, St. Benedict of Norcia founded the Abbey of Monte Cassino[12] on the summit of Montecassino, on the southern edge of the Latin Valley, which represented a point of reference for the Christian identity of Western Europe.

The hopes of municipal autonomy of the main cities of the Middle Latin Valley, including for example Ferentino and Alatri, as well as others in the neighboring regions, but in any case subject to papal authority, pushed pope Innocent III to establish the Province of Campagna e Marittima in the XII century.

In Monte San Giovanni Campano, on the right bank of the Liri, the castle where the saint was imprisoned by his family is preserved in excellent condition.