 During the work of river channelling in 1955–56 at Isolone della Prevaldesca (an area near Valeggio) a pile-dwelling settlement came to light which led to the collection of 16,000 finds; some tombs and other finds dating to the Iron Age were found in (in 1933 a metallic urn dating to the First Iron Age was found) and some finds associated with the Etruscan civilization (ornaments and jewellery were found in the Mincio Valley).A large Celtic necropolis, found in 1984 still partly buried under the current town, would prove the presence of that people from the 4th century BCE and the 1st century CE.In the necropolis, found in 1984, were also discovered finds and marble funeral monuments from Roman times, as well as traces of traffic connections linking the ford on the river to consular roads.