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Marengo is the name of a département of the First French Empire in present Italy. It was named after the Marengo plain near Alessandria to commemorate the Battle of Marengo (1800). It was formed in 1802, when Napoleon Bonaparte occupied Piedmont. Its capital was Alessandria. It was divided into the arrondissements of Alessandria, Asti and Casale Monferrato. It was disbanded after the defeat of Napoleon in 1814. Its territory is presently divided between the Italian provinces of Alessandria and Asti.
