Porta Tosa was the eastern gate of the Spanish walls of Milan, dating back to the 16th century. During the Five Days of Milan, Porta Tosa was the first to be conquered by the Milanese rebels, on 22 March 1848 (an event known as "The Battle of Porta Tosa"). In 1861, when the Italian unification was completed, the gate was renamed "Porta Vittoria" (Victory Gate) after that victorious episode.