Sabina (Latin: Sabinium), also called the Sabine Hills, is a region in central Italy. It is named after Sabina, the territory of the ancient Sabines, which was once bordered by Latium to the south, Picenum to the east, ancient Umbria to the north and Etruria to the west. It was separated from Umbria by the River Nar, today's Nera, and from Etruria by the River Tiber. Today, Sabina is mainly northeast of Rome in the regions Lazio, Umbria and Abruzzo. Upper Sabina is in the province of Rieti (Poggio Mirteto, Magliano Sabina, Casperia, Montopoli di Sabina, Torri in Sabina, Cantalupo in Sabina, Montebuono, Forano, Poggio Catino, Montasola, Stimigliano, Castelnuovo di Farfa, Fara in Sabina, Roccantica, Mompeo, Salisano, Cottanello, Configni, Vacone, Tarano, Collevecchio, Toffia, Poggio Nativo, ecc.). Sabina Romana is in the province of Rome (Mentana, Monteflavio, Montelibretti, Monterotondo, Montorio Romano, Moricone, Nerola, Palombara Sabina). Part of Sabina is in the regions of Umbria (territories of Narni, Amelia, Cascia, Norcia, partially Upper Valnerina, etc.) and Abruzzo (from Valle dell'Aterno to L'Aquila).
Some Sabines who lived in two of the Seven Hills of Rome (the Quirinal and Viminal) formed part of the postulation of Rome (together with the Latins who lived on the other hills) at the time of its foundation. The second king of Rome, Numa Pompilius, was from Cures, the capital of Sabina. During the reigns of the Roman kings Ancus Marcius and Tarquinius Priscus the Sabines attacked Roman territory several times. This also occurred during the early period of the Roman Republic. After the Third Samnite War (298-290 BC), the Romans moved to crush the Sabines. The Roman consul Manius Curius Dentatus pushed deep into Sabina in the area between the rivers Nar (today’s Nera, the main tributary of the River Tiber) and Anio (Aniene, another tributary of the Tiber) and the source of the River Avens (Velino). Spurius Carvilius confiscated large tracts of land in the plain around Reate (today’s Rieti) and Amiternum (11 km from L'Aquila), which he distributed to Roman settlers. Florus did not give the reasons for this campaign. The modem historian Salmon speculates that "it might have been because of the part they [the Sabines] had played or failed to play in the events of 296/295 [BC]."  That is, they let the Samnites cross their territory to go to Etruria and join forces with the Etruscans, Umbrians and Senone Gauls. Forsythe also speculates that it may have been a punishment for this. Livy mentioned that Dentatus subdued the rebellious Sabines. The Sabines were given citizenship without the right to vote (civitas sine suffragio), which meant that their territory was effectively annexed to the Roman Republic. Reate and Amiternum were given full Roman citizenship (civitas optimo iure) in 268 BC.
In the Augustan division of Italy, Sabina was included in the region IV Samnium. With Diocletian's late 3rd-century administrative reforms, Italy became a Roman diocese and was subdivided into Roman provinces. Sabina became part of the province of Samnium. Constantine the Great turned Italy into a praetorian prefecture and subdivided it into two dioceses. Sabina fell under the diocese of Italia suburbicaria as the province of Valeria. With the Lombard invasion of Italy in the Early Middle Ages, the territory of Sabina became part of the Lombard Duchy of Spoleto. With the Byzantine reconquest of central Italy, it came under the Duchy of Rome of the Byzantine Exarchate of Ravenna. With the rise of the Papal States, Sabina was governed directly by the pontificate or indirectly, by the counts of Sabina, a title of the noble Crescentii family in the 10th and 11th centuries. During the late 9th to early 10th century, the region was, along with much of central Italy, a stronghold of, or threatened by the Saracens.