Decima Castle
Decima Castle is a medieval fortification located in the Lazio region of central Italy at approximately 41.75° N, 12.44° E, placing it in the Castelli Romani foothills south of Rome or the broader Agro Romano. The name “Decima” (meaning tenth) historically referred to a point on an ancient road or boundary — a type of toponym widespread in the Roman countryside since classical antiquity — suggesting the site’s origins as a landmark along a consular road or territorial division of the Roman ager. The castle developed as a feudal stronghold controlling this position through the medieval period.
At a glance
- Type
- Medieval feudal castle
- Period
- 11th–14th century
- Style
- Central Italian Latial military architecture
- Location
- Lazio, Italy (south of Rome)
- Coordinates
- 41.7555° N, 12.4386° E
Overview
Decima Castle occupies a position in the Roman countryside that has been inhabited since antiquity, as the territory south of Rome was densely settled in the Roman and medieval periods. The castle would have controlled local agricultural land, a road junction, or a water source — resources of fundamental importance in the post-Roman Latial landscape. This area of Lazio was subject to intense feudal conflict between the Papacy, the great Roman baronial families, and local lords throughout the medieval period.
History
The castle’s history unfolds within the framework of the medieval Patrimony of Saint Peter, the band of territory in central Italy under papal temporal authority. Great Roman families — among them the Colonna, Orsini, Savelli, and Caetani — held castles throughout this zone as part of their competition for influence over the papacy and the surrounding territory. Castles named “Decima” in Lazio are documented from the eleventh century onward, when the feudal reorganisation of the countryside produced a dense network of small fortified centres. The structure was likely abandoned or reduced to a rural estate in the early modern period as the baronial system declined.
What you see
Surviving elements of Decima Castle likely include the base of a tower, sections of curtain wall, and the remains of an associated chapel — the typical components of a small Latial castrum. Construction materials would be local tufa (volcanic stone) and recycled Roman masonry, both abundantly available throughout the Agro Romano and Castelli Romani areas. The surrounding landscape retains a predominantly agricultural character with scattered farmhouses, vineyards, and remnants of the ancient Roman road network.
Cultural significance
Castles of the Roman countryside are primary documents of the post-Roman and medieval transformation of Italy’s most historically layered landscape. Decima Castle participates in the heritage of the Latial castra — a subject of sustained scholarly interest given the region’s importance in Italian political history — and is subject to protection under Italian cultural heritage legislation.
Practical information
- Location
- Lazio, south of Rome, Italy
- Access
- Check local comune or regional heritage office for current access arrangements
- Hours
- Check official sources for visiting information
Getting there
The area south of Rome is served by multiple rail lines from Roma Termini, including the line toward Velletri and the Castelli Romani network. By car, the Via Appia Nuova (SS7) and Via Laurentina (SR601) are the main routes through the Agro Romano toward the Castelli. Rome Fiumicino Leonardo da Vinci airport is approximately 30–40 kilometres to the west, and Roma Ciampino airport is approximately 15 kilometres north of the southern Roman suburbs.