Castello Caetani di Sermoneta

High above the roofs of Sermoneta, the fortress keeps the crest of the hill, and the borgo still arranges itself around its walls. Frescoed chambers, service kitchens and a large parade ground preserve the history of the Annibaldi barons, the Caetani lords, a Borgia garrison and the family that restored the castle.

Why it matters

Sermoneta clings to a spur of the Monti Lepini, and the castle holds its crest. The keep known as the Maschio still rises about 42 metres, flanked by its lower companion tower, the Maschietto, a defensive pairing that defines the skyline for kilometres across the Pontine Plain. This was never a ruin kept at arm's length: the Fondazione Roffredo Caetani, heir of the family that owned the castle for seven centuries, maintains it as a furnished, visited residence where medieval masonry, Renaissance decoration and early twentieth-century restoration sit side by side. The castle preserves elements from its periods as a baronial residence, papal fortress and family home.

What to notice

The square Maschio and round-based Maschietto form a defensive pair; their arrangement reflects the development of artillery-era fortification. The Piazza d'Armi is a wide parade ground inside the walls, beside a large cistern that once held water for the garrison. Inside, the Camere Pinte, frescoed around 1470 with mythological and allegorical scenes, were prepared for distinguished guests; the Cardinal Hall and the kitchen, with its enormous fireplace and bread oven, show the domestic machinery of a great household. The vaulted stables, insulated with reed keeping, hold a steady temperature and have hosted chamber music seasons for decades. The ramparts overlook the Pontine Plain and the sea.

Context and history

The castle's documented story opens in the thirteenth century under the Annibaldi barons. In 1297 Pietro Caetani, Count of Caserta, bought Sermoneta, Bassiano and San Donato for 140,000 gold florins, adding Ninfa for another 200,000, with the help of his uncle, Pope Boniface VIII. The Caetani expanded through the fifteenth century, and around 1470 the painted rooms were decorated. In 1499 Pope Alexander VI Borgia excommunicated the family, seized their lands and turned the castle into a military fortress: walls were reinforced, the Rivellino outpost known as the Cittadella was built, the top of the Maschio was dismantled and the collegiate church of San Pietro in Corte was razed. Pope Julius II restored the Caetani to Sermoneta in 1504. On 2 April 1536 Emperor Charles V was hosted here by Bonifacio I Caetani with a retinue of 1,000 horsemen and 4,000 foot soldiers. Decline followed — the family drifted to Rome in the seventeenth century, Spanish and French troops damaged the rooms in the eighteenth, and in the nineteenth the castle served as a military warehouse. From the late nineteenth century the Caetani returned, with Gelasio Caetani driving the restoration, and the Fondazione established in 1972 by Lelia Caetani now preserves both the castle and the Giardino di Ninfa.