Regio VI Umbria (also named Regio VI Umbria et Ager Gallicus) is the name for one of the 11 administrative regions into which the emperor Augustus divided Italy. The main source for the regions is the Historia Naturalis of Pliny the Elder, who informs his readers he is basing the geography of Italy on the descriptio Italiae, "division of Italy", made by Augustus. The Regio Sexta ("6th Region") is called Umbria complexa agrumque Gallicam citra Ariminium ("Umbria including the Gallic country this side of Rimini").
Umbria is named after an Italic people, the Umbri, who were gradually subjugated by the Romans in the 4th through the 2nd centuries BC. Although it passed the name on to the modern region of Umbria, the two coincide only partially. Roman Umbria extended from Narni in the South, northeastward to the neighborhood of Ravenna on the Adriatic coast, thus including a large part of central Italy that now belongs to the Marche; at the same time, it excluded the Sabine country (generally speaking, the area around modern Norcia) and the right bank of the Tiber, which – being inhabited by Etruscans – formed part of Regio VII Etruria: for example Perusia (the modern Perugia) and Orvieto (its ancient name is unknown), two Etruscan cities – were not part of Roman Umbria; on the contrary Sarsina, Plautus birthplace, was considered to be "in Umbria", while today it is in the modern province of Forlì-Cesena, in Emilia-Romagna.
