was under the rule of the pisan della Gherardesca family and then, from 1355, it was incorporated in the Kingdom of Sardinia by the Aragonese. The medieval diocese of Sulcis retained its name until the move of the seat from Tratalias to Iglesias in 1506. It had two cathedrals: the first in the ancient city of Sulci, the Roman-Byzantine basilica dedicated to the founder of the diocese, Antiochus of Sulcis; the second in a Romanesque church in the village of Tratalias dedicated to Saint Mary of Montserrat. From the 14th century to the modern era, as a result of wars (Sardinian–Aragonese war), the black plague and saracen raids, this territory was completely depopulated, Giovanni Francesco Fara in 1580 described this region has wild and abandoned. In the 17th century there were only two inhabited villages in the entire Sulcis, Portoscuso and Teulada. In the 18th century, during the Savoy era, began a process of repopulation, mainly carried out by families from the nearby Iglesiente, particularly from Iglesias, who were granted lands of feudal domains for the exercise of the agriculture and pastoralism. The distance of the concessions from the residential centers in the north, in the order of tens of kilometers, was such as to require the construction of permanent settlements for residential purposes and protection of the territory, the so-called furriadroxius and the medaus. This dynamic has therefore favored a colonization with a population dispersed in scattered settlements of small size, comparable to small modest farms but basically autonomous. The arrival of new families of settlers, over time, developed a tendency of furriadroxius to congregate around a church. The original settlements, following these enlargements, turned into an aggregated group of more housing units, called boddeu (set of furriadroxius), similar to a village but with no roads. Most of the inhabited centers of the Sulcis, today communes or villages, have developed between the 18th and 19th centuries because of expansion of boddeus, taking the name of the ancient medieval centers disappeared. Even the Sant'Antioco Island and the San Pietro Island were repopulated with the birth, near the ancient ruins Sulci, of Sant'Antioco, which developed around the Byzantine era basilica dedicated to the eponymous saint of the island, and Carloforte (1738) and Calasetta (1770), populated by Ligurian refugees coming from the island of Tabarka, Tunisia. The region has rich coal deposits, commercially exploited since the 1850s. Coal mining has been the