The Castle of Salvaterra was probably built as part of urbanization after 1258 under Ugolino della Gheradesca.
It was designed as a bulwark from which to survey the town and its surroundings as far as the silver mines.

In 1297 Sardinia and Corsica were made subject to the Crown of Aragon by Pope Boniface VIII, but were not taken possession until 1324.
The castle of San Guantino changed its name to Salvaterra and its status; a 1325 stone slab calls it castris regalis, a royal castle.

The square castle's northern and eastern sides, built in courses of stone alternating with brick, seem to adhere to the original medieval plan and confer solidity.
It had a chapel dedicated first to San Guantino and later to Eulalia of Barcelona.
The castle well has been rebuilt in its internal courtyard.
The Castle of Salvaterra was probably built as part of urbanization after 1258 under Ugolino della Gheradesca. It was designed as a bulwark from which to survey the town and its surroundings as far as the silver mines.
In 1297 Sardinia and Corsica were made subject to the Crown of Aragon by Pope Boniface VIII, but were not taken possession until 1324. The castle of San Guantino changed its name to Salvaterra and its status; a 1325 stone slab calls it castris regalis, a royal castle.
The square castle's northern and eastern sides, built in courses of stone alternating with brick, seem to adhere to the original medieval plan and confer solidity. It had a chapel dedicated first to San Guantino and later to Eulalia of Barcelona. The castle well has been rebuilt in its internal courtyard.
Iglesias, Sardinia