del tesoro di Sant'Eulalia (Treasure Museum of Saint Eulalia of Barcelona; with its important Roman era underground area. Orto botanico di Cagliari (University Botanical Gardens) Feast of Sant'Efis The Feast of St. Ephysius (Sant'Efisio in Italian, Sant'Efis in Sardinian) is the most important religious event of Cagliari, taking place every year on 1 May. During this festival, thousands of people from folk groups all over Sardinia wear their traditional costumes. The saint is escorted by the traditional ancient Milicia, the deputy mayor (Alter Nos), numerous confraternities, and a convoy of chariots pulled by oxen in a procession to Nora (near modern Pula), from Cagliari, where, according to tradition, he was beheaded. In addition to being one of the oldest, it is also the longest Italian religious procession, with about of walks over four days, and the largest in the Mediterranean area. A plague was spreading throughout Sardinia, starting in 1652, and the epidemic infected Cagliari in particular, killing some ten thousand inhabitants. According to legend, in 1656 St. Ephysius appeared to the Spanish Viceroy, Francisco Fernández de Castro Andrade, Count of Lemos to request a procession on 1 May, in order to free the city from the plague. The Municipality of Cagliari swore that, if the plague disappeared, a procession would be held every day in the saint's honor, starting from the Stampace district and ending at Nora where the saint was martyred. In September the plague ended, and the procession and festival was therefore regularly held starting the following year on 1 May. The procession was held even during the last war; a statue of the saint was placed on a lorry and, through city ruins of the devastated by the bombs, arrived safely in Nora. Other events Other feasts and events in Cagliari include: The Carnival Holy Week and Easter celebrations Sea processions of St. Francis of Paola, held in May, and Nostra Signora di Bonaria, in July Cagliari Fair, in early May Audi MedCup regatta Languages The native language of Cagliari, declared official along with Italian, is Sardinian (sardu), a Romance language, specifically the Campidanese dialect (campidanesu) in its local variant (casteddaju). The variant of Cagliari in its high register has traditionally represented the linguistic model of reference for the entire southern area of the island, and the high social variant used by the middle class in the whole Campidanese domain, as well as the literary model