Kingdom of Sardinia and Aosta, dynastic possessions since the 11th century, the Principality of Piedmont (a possession built up in the 13th century), and the County of Nice (a possession since 1388). While in theory the traditional capital of the island of Sardinia and seat of its viceroys was Cagliari, the Piedmontese city of Turin was the "de facto" capital of Savoy. When the mainland domains of the House of Savoy were occupied and eventually annexed by Napoleonic France, the king of Sardinia made his permanent residence on the island for the first time in its history. The Congress of Vienna (1814–15), which
Iglesias, Sardinia Iglesias, Sardinia Iglesias ( ; ) is a "comune" and city in the province of South Sardinia in Italy. It was co-capital of the province of Carbonia-Iglesias with Carbonia, and the province's second-largest community. Under Spanish control Iglesias was one of the most important royal cities on Sardinia, and it is the seat of the Roman Catholic Diocese of Iglesias. At an elevation of in the hills of southwestern Sardinia, it was the centre of a mining district from which lead, zinc, and silver were extracted. Iglesias was also a centre for the distillation of sulfuric acid. The area around