Pietraroja has
Samnite origin and has occupied various sites in its territory, currently on its fourth definitive site erected after the catastrophic
earthquake of June 5, 1688. Its territory is part of the central-southern zone of the
Apennines included between the
Mainarde mountains and the
Matese massif, inhabited in the antiquity by
Pentri Samnites that set their capital in
Bojano. Its inhabitants had certainly involved in the
Samnite Wars as well as in social ones against Rome suffering the
Pentri's genocide perpetrated by
Lucius Cornelius Sulla. The Roman domination Latinized the
Samnium leaving also a greatest influence on Pietraroja dialect, in which it is lost every trace of Oscan language previously spoken by
Samnites. After the Roman one, Pietraroja has undergone the various dominations of Samnium (
Lombard,
Norman,
Hohenstaufen,
Angevin,
Catalan-Aragonese,
Spanish, etc.). After Lombard rule under the
gastalds of
Telese, Pietraroja was part, from the 12th to the 14th century, of the fief of the Sanframondos, a family of Norman origin. Their possessions included, among the others, the territories of
Cerreto Sannita,
Cusano Mutri, Pietraroja,
Guardia Sanframondi,
Limatola,
San Lorenzo Maggiore,
Massa,
Faicchio,
Ponte as well as
Dugenta in
Terra di Lavoro and Bojano and
San Giuliano del Sannio in
Molise. In the 15th century Pietraroja was handed over to the Marzanos family and later to Onorato Gaetani. Subsequently, the town was held by the
Carafa, whose possessions were also extended in
Molise; they held it until the abolition of feudalism in 1806. Pietraroja has been a centre of the Bourbon reaction after the annexation of the
Kingdom of the Two Sicilies to that of Italy in 1861. With Guardiaregia, Sepino, Campobasso, Cusano Mutri it has been one of the centres of the brigandage of the southern massif of the
Matese. In December 1863 the national guard besieged the brigands sheltered in the cave known as
Cava dei Briganti and convinced them to go out, saving their lives in change. The promise was not kept and they were shot in the place named
Aria corta situated behind the town building, After the
unification of Italy, Pietraroja has experiment a strong emigration, especially towards the United States. After
World War II, the flow directed to northern and central Italy and to Europe (Switzerland, Germany and England). The opening of a stone quarry in the place named "Canale", moreover closed subsequently, of a clay quarry in the place "Saure" no more drawn out for the cheap quality and of coloured marble quarry in the place "Pesco Rosito", open but never operating, did not reduce emigration. ==Climate==