 According to some theories, the foundation of the town would be linked to the destruction of the Roman colony of Interamna Lirenas, although the first historically documented human presence dates to the foundation of several monasteries, with the annexed boroughs, by the Abbey of Montecassino (10th century).The name "Esperia" was chosen in 1867 when the current "frazioni" of Roccaguglielma and San Pietro merged into a single municipality, with the former as the municipal seat.During World War II Esperia was one of the towns suffering heavily from "Marocchinate" - the mass rape committed after the Battle of Monte Cassino by Goumiers, Moroccan colonial troops of the French Expeditionary Corps.