The Siviller Castle, also known as the Casa Forte (Fortified House), stands in the historic center of Villasor and represents a rare and precious example of fortified residential architecture in medieval Sardinia.
The building was erected in 1415 by will of Giovanni Siviller, feudal lord of the village and former customs officer of the Castle of Cagliari. Its construction, authorized upon the remains of an ancient rural church, met a precise military need: to protect the territory from raids by surviving Arborean rebels following the long conflict between the Judicate of Arborea and the Crown of Aragon.
Architecturally, the complex displays a distinct Gothic-Aragonese imprint. The main structure features a characteristic U-shaped layout spanning three levels, crowned by striking Guelph merlons and elevated corners shaped like turrets At its center opens a spacious inner courtyard, once protected by high walls made of ladìri, the traditional sun-dried earthen bricks of the Campidano region.
In the 16th century, following a marriage to the founder’s daughter, the property passed to the powerful Alagón family, under whose rule the fortress became the prestigious seat of the Marquisate of the same name, losing its wartime function to transform into a stately manor.
Declared a National Monument in 1910, today it belongs to the Municipality of Villasor and serves as a vibrant cultural hub hosting exhibitions and events.
