The name is said to derive from su piscu, the bishop of the diocese of Barbaria, who received numerous donations from the judges of Cagliari, including the land where the archaeological park stands. The Piscu Nuraghe stands imposingly on a hill, along the SS 128 road to Senorbì and Mandas, just a short distance from Suelli, which was the bishop's seat in the Middle Ages and has always been a centre of veneration for Saint George the bishop.

Mentioned in various medieval documents and known locally as sa domu de s orcu, the Piscu is the most monumental and best preserved of the 200 nuraghi surveyed in Trexenta, archaeologically 'investigated' and restored in the 1980s. The majestic complex architecture arose between the Middle and Recent Bronze Age (15th-11th centuries BC), built of marl blocks, hewn and arranged in regular rows, and consisting of a main tower, the oldest of the structure, and four corner towers, joined by thick walls, which were built at a later stage. Inside the bastion, almost a square with sides of about thirty metres in length, is a courtyard. Around it, a low bulwark of large boulders 'embraces' five projecting towers and encloses a village of numerous circular and quadrangular huts.