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In 2010, Voltri and the nearby hamlets included in Genoa's VII Municipio (Crevari, Acquasanta, Vesina) had a total population of 13,096.
The area of Voltri was inhabited since prehistoric times, and was a center of the Ligures tribe of the Veituri, from which it probably took its name. In 105 BC it was reached by the Roman road Via Aemilia Scauri which connected it to Genoa and then to Rome. In the Middle Ages it was a hamlet part of the Republic of Genoa, its main activity being the production of paper.
In 1796 it was the site of a battle between the French troops of Napoléon Bonaparte and of the Austrian Empire allied with the Kingdom of Sardinia-Piedmont. After the fall of the First French Empire, it became an autonomous commune in the Sardinian territories, a status it kept until 1926, when the Fascist government united it to Genoa.
- Sanctuary of Madonna delle Grazie, a Capuchine monastery
- Sanctuary of Nostra Signora dell'Acquasanta (built in 1683-1718), a Baroque sanctuary housing works by Lazzaro Tavarone, Anton Maria Maragliano, Antonio Brilla and Domenico Fiasella.
- Church of Sant'Ambrogio
- Villa Brignole Sale Duchessa di Galliera