Asmall site on the rocky island of Tavolara off the coast of Sardinia may reveal a robust trading relationship between two Iron Age cultures. In the ninth century B.C., the Nuragic people of the main island of Sardinia exchanged ceramic and metal artifacts with the Villanovans, early Etruscans who inhabited central Italy. Although brooches and other Villanovan metal objects have been unearthed occasionally on Sardinia, evidence of exchange between the cultures has come primarily from Nuragic artifacts found in the tombs of high-status Villanovans in northern Etruria. As a result, scholars think that the Nuragic people and Villanovans mostly interacted...