The altar of Monte d'Accoddi (very near to the town but in the municipality of Sassari) witness the human presence in that area during this ages. Bronze and Nuragic Age Finds dated at this ages has been find in the Necropolis of Su Crucifissu Mannu. In this necropolis has been find two skulls with the presence of some sort of surgical procedure probably practiced to heal issues like migraines and tumors. Another theory is that this surgical procedure has been practiced for religious and/or magical purposes. Many nuraghes belong to this ages, and nowadays only 7 of these structures are in a well state of preservation. The Domus de Janas of Andreolu also witness the presence of the Nuragic civilization. Roman period (46 BC – 455 AD) In ancient times, Turris Libisonis was one of the most considerable cities in Sardinia. It was probably of purely Roman origin, founded apparently by Julius Caesar, as it bore the title Colonia Julia. Pliny described it as a colony, the only on the island in his time, suggesting that there was previously no town on the spot, but merely a fort or castellum. It is noticed also by Ptolemy and in the Itineraries, but without any indication that it was a place of any importance. The ancient remains still existing prove that it must have been a considerable town under the Roman Empire. According to inscriptions on ancient milestones, the principal road through the island ran directly from Caralis (Cagliari) to Turris, a sufficient proof that the latter was a place much frequented. Indeed, two roads, which diverged at Othoca (modern Santa Giusta) connected Caralis to Turris, the more important keeping inland and the other following the west coast. It was also an episcopal see during the early part of the Middle Ages. There exists also the remains of a temple (which, as we learn from an inscription, was dedicated to Fortune, and restored in the reign of Philip between 247 and 249), of thermae, of a basilica and an aqueduct, as well as a bridge over the adjoining small river, still called the Fiume Turritano. After the Western Roman Empire The ancient city continued to be inhabited till the 11th century, when most of the population migrated to Sassari, about inland, and on a hill. It was partly under Genoese hands until the early 15th century, when it was conquered by the