ABSTRACT
These three regions did not form a unitary domain until at least the late Middle Ages (Vignuzzi (1988: 606)). As for Lazio, only in 1923 was the province of Rieti annexed to it (from Umbria); a few years later, there was a large-scale incorporation of territories – originally part of the Kingdom of Naples – to the east and north-east (Amatrice, Leonessa, Cittaducale, the Cicolano area). On its southern boundary, Lazio acquired the territories of Sora, Cassino and Gaeta, also originally under the Kingdom of Naples.
