- Population: about 30,000 inhabitants
- Zip/postal codes: 09170
- Dialing Area Code: +39 0783
- Patron Saint: Sant'Archelao, celebrated on 13 February
- Frazioni & Localities: Donigala, Massama, Nuraxinieddu, Silì, Torre Grande
In the Middle Ages there were frequent wars among Arborea and the other Sardinian kingdoms, which one after the other fell into the power of the Aragonese. Arborea was conquered by the Spaniards in 1478 after the Macomer battle, and was under the Aragonese until 1708, then under the Spaniards until 1720 and finally came under the Piedmontese. Oristano was made capital of the newly established province of the same name in 1975.
What to see
- The Portixedda tower, built at the time of the early medieval fortifications, 8.8 mt tall, and consisting of two separate round structures joined through an oblique plane.
- The Cathedral of Santa Maria Assunta, built in 1130 on a previous Byzanthine temple, whose remains are still visible in the gardens. The church was restored in the 17th century, but 3 chapels were left in the ancient Romanesque style. In the chapel of "Rimedio" there is the sepulchre of Filippo Mameli dated 1348. In the center of the presbytery there is, next to the Virgin Mary, an image of St. Archelaus, patron of the town.
- The church of Sant'Efisio Martire, whose construction began in 1792, in the district called Su Brugu, to commemorate a vow to the saint, that apparently saved the population from the French invasion. Every year a procession with the saint's statue is carried on a waggon drawn by two oxen and escorted by knights on horseback. The procession stops at the Basilica del Rimedio, at Donigala Fenughedu, and finally at Tharros, where the tradition says that the French troops were stopped.