More than 3,000 years after the first nuraghi rose across Sardinia, some of these massive stone towers still shaped community life in ways archaeologists are only beginning to understand. New research at Nuraghe Barru, a site in south central Sardinia, suggests one of these ancient structures did not fade into irrelevance at the start of the Iron Age. Instead, it became a place where ritual acts, social identity, and regional connections intersected.
The study, led by researchers from the University of Tübingen and Italian heritage authorities, examined ritual deposits found inside and around the monument. By combining archaeology, geology, and materials science, the team traced the origins of pottery and analyzed the composition of metal objects. Their results point toward organized ritual activity linked to wider exchange networks across Sardinia and beyond.
Sardinia contains nearly 7,000 nuraghi, stone towers built during the Bronze Age between roughly 1700 and 1100 BCE. Their original role still sparks debate. Some scholars view them as defensive structures, others as residences, gathering places, or ritual centers. During the Final Bronze Age and Early Iron Age, between about 1200 and 800 BCE, Sardinian society changed. New sanctuaries, sacred wells, and ceremonial spaces appeared across the island.
Archaeologists wanted to know whether older nuraghi lost their meaning during this shift or adapted to new social and religious conditions.
Excavations at Nuraghe Barru produced evidence favoring the second possibility.
Inside the tower complex, researchers uncovered a sealed cistern well. At its base lay a deliberate deposit of broken pottery, including jugs, a miniature amphora, and a rare four-handled ceremonial vessel. The assemblage also contained human and animal remains placed there intentionally. After the deposit, limestone slabs sealed the well.
Nearby, along a staircase, archaeologists found metal offerings. These included a bronze sword nearly one meter long, three blade-like bronze objects resembling razors, and a lump of copper. The staircase later became blocked, cutting off access to the upper level of the structure.
Taken together, the finds do not resemble ordinary disposal or abandonment. They point toward a planned ritual episode that altered the monument itself.
The team used ceramic petrography, which identifies minerals inside pottery, to examine where the vessels came from. Many were not locally made. Their mineral composition linked them to different geological zones across Sardinia, some more than 40 kilometers from Barru.
Those results suggest movement of people, materials, and practices between communities. Nuraghe Barru appears connected to broader interregional networks active during late Nuragic society.
The metal objects tell a related story. Portable X-ray fluorescence analysis found copper-rich, low tin bronze alloys in both the sword and the razor-like implements. The sword matches known Nuragic votive swords, objects associated with ceremonial use rather than warfare.
The razor-shaped pieces resemble examples from mainland Italy. Their form hints at contact with cultural traditions from the Italian Peninsula. Yet their chemical composition leans toward local production instead of direct importation.
The researchers stress that their sample size is limited and does not represent all Nuragic ritual practice. Even so, Barru offers a carefully documented case study for examining how older monuments functioned during a period of social transition.
The findings suggest continuity alone does not explain what happened at Nuraghe Barru. The tower’s role changed. Ritual deposits, imported pottery traditions, and symbolic metal offerings point toward an active reshaping of how communities used and understood these older structures.
During the Early Iron Age, formal sanctuaries gathered offerings and accumulated political and economic importance across Sardinia. Yet sites such as Barru show that some pre-existing nuraghi still held authority within their territories. Communities continued to invest meaning in them, adapting ancient architecture to fit changing religious and social needs.
The evidence from Barru adds another layer to the picture of late Nuragic Sardinia. Rather than isolated settlements tied only to local traditions, communities across the island participated in networks of exchange, shared practices, and shifting forms of power. An old stone tower built centuries earlier remained part of that changing landscape.
Publication: Amicone, S., Tiezzi, V., Broisch-Höhner, M., Freund, K. P., Heinze, L., Morandi, L. F., … Pilo, C. (2026). Ritual and connectivity in Nuragic Sardinia: An interdisciplinary study of ceramics and metalwork from nuraghe Barru. Open Archaeology, 12(1). doi:10.1515/opar-2025-0078
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