In the necropolis 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.

The creation of the villages of Valeggio and Borghetto dates to the Lombard rule in Northern Italy because their names derive from 'flat place' and 'fortified settlement' respectively.

The large medieval fortifications which characterize Valeggio (Scaliger castle, the Visconti Bridge and the Serraglio defensive line) were built between the 13th and the 14th centuries.

In 1405 Valeggio became part of the Republic of Venice, and subsequently lost its strategic role, becoming an agricultural center and a silkworms trading market.

In World War II, on 14 February 1944, an American aircraft B-17 fell during a dogfight in the locality of Vanoni-Remelli, causing the death of pilot Harold Arthur Bond Jr. and a civilian who was working in the fields near a water canal.