Sardinia world (22 centenarians/100,000 inhabitants). Sardinia is the first discovered Blue Zone, a demographic and/or geographic area in the world with an oversize concentration of centenarians and supercentenarians. In 2016 there were 50,346 foreign national residents, forming 3% of the total Sardinian population. The most represented nationalities were: Sardinia's most populated cities are Cagliari and Sassari. The Metropolitan City of Cagliari has 431,302 inhabitants, or about ¼ of the population of the entire island. Eurostat has identified in Sardinia two Functional Urban Areas: Cagliari, with 477,000 inhabitants, and Sassari, with 222,000 inhabitants. Sardinia is one of the five Italian autonomous regions,
History of Sardinia along the coast (today called "Spanish towers") to protect the island against Ottoman incursions. In 1637 a French fleet led by Henri, Count of Harcourt sacked Oristano for about a week. Sardinia was disputed between 1700 and 1720. After the War of the Spanish Succession it was assigned to Emperor Charles VI in 1714, Philip V of Spain briefly recovered the island in 1717, but in 1720 the European powers assigned Sicily to Charles VI and Sardinia to the House of Savoy, so Vittorio Amedeo II became the King of Sardinia. In 1793 Sardinians defeated twice the French invaders. On