House of Savoy. Since the mid-19th century, thanks to the reopening of nearby mines, Iglesias has experienced a period of economic, social and cultural renewal. Many miners, workers and technicians from elsewhere on Sardinia and northern Italy settled in the city, whose population increased from 5,000–6,000 during the 1850s to about 20,000 in the early 20th century. After the Second World War the Sardinian mining sector was in crisis, the effects of which involved the Iglesiente's mines and the town of Iglesias. Demographics On 31 December 2015, 418 foreigners lived in Iglesias. The largest immigrant groups came from Romania, Senegal and China. The town's population is overwhelmingly Roman Catholic. Economy Iglesias' economy has waxed and waned because it has been largely focused on mineral resources. During the 21st century, with little surviving mining activity, the town has tried to emphasise medieval tourism with a medieval parade, a tournament of archers and a living game of chess. Attractions Castle of Salvaterra 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. Santa Chiara Cathedral Construction of the Santa Chiara Cathedral was an initiative for demographic and urban development undertaken by the Donoratico della Gherardesca family. The cathedral has a variety of architectural styles. Over the centuries it has been transformed several times by successive rulers or restoration, particularly during the 19th century). The cathedral's façade, with a pitched roof, is divided into two parts by a horizontal, moulded cornice at the level of the architrave over the doorway. It has a large nave with six side chapels, and a cross-vaulted roof supported on pillars with carved capitals. The cathedral's bell tower houses a 1337